Augustus De Morgan

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Augustus De Morgan (27 June 1806 – 18 March 1871) was a British mathematician and logician. He is best known for De Morgan's laws, relating logical conjunction, disjunction, and negation, and for coining the term "mathematical induction", the underlying principles of which he formalized.^[1] De Morgan's contributions to logic are heavily used in many branches of mathematics, including set theory and probability theory, as well as other related fields such as computer science.

Biography

Childhood

Augustus De Morgan was born in Madurai, in the Carnatic region of India, in 1806.^[2]Template:Efn His father was Lieutenant-Colonel John De Morgan (1772–1816), who held various appointments in the service of the East India Company, and his mother, Elizabeth (née Dodson, 1776–1856), was the granddaughter of James Dodson, who computed a table of anti-logarithms (inverse logarithms).^[3] Augustus De Morgan became blind in one eye within a few months of his birth. His family moved to England when Augustus was seven months old. As his father and grandfather had both been born in India, De Morgan used to say that he was neither English nor Scottish nor Irish, but a Briton "unattached," using the technical term applied to an undergraduate of Oxford or Cambridge who was not a member of any one of the colleges.

When De Morgan was ten years old, his father died.^[2] His mathematical talents went unnoticed until he was fourteen when a family friend discovered him making an elaborate drawing of a figure from one of Euclid's works with a ruler and compasses.^[2] He received his secondary education from Mr. Parsons, a fellow of Oriel College, Oxford, who preferred classics to mathematics.

Education

In 1823, at the age of sixteen, De Morgan enrolled in Trinity College, Cambridge,^[4] where his teachers and tutors included George Peacock, William Whewell, George Biddell Airy, H. Parr Hamilton, and John Philips Higman. Both Peacock and Whewell would influence De Morgan's selection of algebra and logic for further research.Template:Sfn

De Morgan placed fourth in the Mathematical Tripos, earning a Bachelor of Arts degree. To obtain the higher degree of Master of Arts and become eligible for a fellowship, he was required to pass a theological test. Although he was raised in the Church of England, De Morgan strongly objected to taking this test. Unable to advance in academia due to his refusal, he entered Lincoln's Inn to pursue a career in law.Template:Sfn

Career

London University, 1827–1831

The London University (now known as University College London) was founded in 1826 as a secular alternative to Oxford and Cambridge; Catholics, Jews, and dissenters could enter as students and hold positions. Prior to opening in 1828, the University advertised 24 vacancies for professorship, two in mathematics, to which De Morgan applied.Template:Sfn Template:Sfn

De Morgan was appointed Professor of Mathematics on 23 February 1828 at the age of twenty-one. The Council of the London University had failed to recruit Charles Babbage and John Herschel to the position. Ultimately the search committee, steered by founder Lord Brougham, Olinthus Gregory, and Henry Warburton, selected De Morgan from a field of at least 31 candidates including Dionysius Lardner, Peter Nicholson, John Radford Young, Henry Moseley, John Herapath, Thomas Hewitt Key, William Ritchie, and John Walker.Template:Sfn Template:Sfn

De Morgan's work during this period focused on mathematical instruction: His first publication was The Elements of Algebra (1828),Template:Sfn a translation of a French textbook by Template:Interlanguage link, followed by Elements of Arithmetic (1830),Template:Sfn a widely used and long-lived textbook,Template:Sfn and The Study and Difficulties of Mathematics (1831),Template:Sfn a discourse on mathematical education.

Following a series of squabbles between the faculty, including De Morgan, and the administration, in particular the Warden, Leonard Horner, a dispute arose over the handling of medical student protests calling for the removal of the Professor of Anatomy, Granville Sharp Pattison, on the grounds of incompetence. While De Morgan and others argued that students should have no influence in the matter, the University bowed to student pressure and dismissed Pattison. De Morgan resigned on 24 July 1831, followed by Professors George Long and Friedrich August Rosen.Template:Sfn Template:Sfn

The Society for the Diffusion of Useful Knowledge

In 1826 Lord Brougham, one of the founders of London University, founded the Society for the Diffusion of Useful Knowledge (SDUK) with the goal of promoting self-education and improving the moral character of the middle- and working- classes through cheap and accessible publications.Template:Sfn De Morgan became involved with the SDUK in March 1827; his unpublished manuscript Elements of Statics for the society may have played a role in his appointment to London University.Template:Sfn One of its most voluminous and effective writers, De Morgan published several books with SDUK: On the Study and Difficulties of Mathematics (1831),Template:Sfn Elementary Illustrations of the Differential and Integral Calculus (1832), The Elements of Spherical Trigonometry (1834), Examples of the Processes of Arithmetic and Algebra (1835), An Explanation of the Gnomic projection of the sphere (1836),Template:Sfn The Differential and Integral Calculus (1842),Template:Sfn and The Globes Celestial and Terrestrial (1845),Template:Sfn as well as over 700 articles in the Penny Cyclopedia and contributions to the Quarterly Journal of Education, the Gallery of Portraits, and the Companion to the British Almanac.Template:Sfn

Private tutor

Following his first resignation from London University, De Morgan started his work as a private tutor.Template:Sfn One of his early students was Jacob Waley. He would tutor Ada Lovelace from 1840 through 1842, primarily via correspondence.Template:Sfn

Actuary

De Morgan's great-grandfather, grandfather, and father-in-law were all actuaries; not surprisingly, De Morgan also worked as a consulting actuary for various life assurance firms, including the Family Endowment Assurance Office,Template:Sfn the Albert Life Assurance Office,Template:Sfn and the Alliance Assurance Company.Template:Sfn He published several articles on actuarial subjects as well as the book An Essay on Probabilities and Their Application to Life Contingencies and Insurance Offices.Template:Sfn However his most notable work as an actuary is his promotion of the work of Benjamin Gompertz, whose "law of mortality" was both under-appreciated and plagiarized.Template:Sfn

Royal Astronomical Society

De Morgan became involved with the Astronomical Society of London in 1828. He would be appointed honorary secretary in 1831, the year in which it received its Royal Charter and became the Royal Astronomical Society.Template:Sfn He would continue as secretary for 18 years and remain actively involved in the Society for 30 years.

London University, 1836–1866

In 1836, De Morgan's replacement as Professor of Mathematics, George J. P. White, drowned; De Morgan was convinced to return and reinstated. That same year the London University was renamed University College and, together with King's College, was made an affiliate of the newly created University of London.Template:Sfn

De Morgan was a highly successful mathematics teacher. For over 30 years his courses covered a full curriculum, from Euclid through the calculus of variations, with his classes often exceeding 100 students. His approach integrated lectures, reading, problem sets, personal instruction, and extensive course notes. He disliked rote learning and viewed mathematics education as learning to reason and core to a liberal education.Template:Sfn Several of his students went on to become mathematicians, most notably James Joseph Sylvester, and some of them, Edward Routh and Isaac Todhunter, well known educators themselves. Many of his non-mathematician students rated him highly; William Stanley Jevons described De Morgan as "unrivalled" as a teacher.Template:Sfn Template:Sfn Jevons, heavily influenced by De Morgan, would go on to do independent work in logic and become best known for the development of the theory of utility as part of the so-called Marginal Revolution.Template:Sfn Template:Sfn

In 1866, the Chair of Mental Philosophy and Logic at University College fell vacant and James Martineau was recommended formally by the Senate to the Council. The Council, at the urging of George Grote, rejected Martineau on the grounds that he was a Unitarian clergyman and instead appointed a layman, George Croom Robertson. De Morgan argued that the founding principle of religious neutrality had been abandoned and immediately resigned.Template:Sfn

Abstract algebra and Sir William Rowan Hamilton

De Morgan was an early proponent of symbolical algebra. First expressed by George Peacock in his Treatise on Algebra (1830) and developed by Duncan Gregory, symbolical algebra was a first step towards abstract algebra, separating the manipulation of symbols from their arithmetic meaning. While symbolical algebra could mechanically construct negative and imaginary numbers, as in the work of Template:Interlanguage link, Jean-Robert Argand, and John Warren, it could not provide their interpretation; De Morgan observed that a similar problem troubled the classical Indian mathematician Bhāskara II in his work Bijaganita.Template:Sfn Template:Sfn

De Morgan would move on from symbolical algebra to develop what he called "logical" or "double" algebra in a series of papersTemplate:Sfn Template:Sfn Template:Sfn Template:Sfn and the book Trigonometry and Double Algebra (1849).Template:Sfn De Morgan's double algebra was never fully developed but remains a precursor to geometric algebra and influenced the Irish mathematician Sir William Rowan Hamilton in his development of quaternions.Template:Sfn Template:Sfn Template:Sfn

De Morgan and Hamilton were friends and correspondents for over 25 years, with De Morgan serving both as a colleague in mathematics, reviewing his Lectures on Quaternions (1853), and as a confidant on personal matters.Template:Sfn Template:Sfn

Mathematical logic and George Boole

The study of logic in Britain underwent a revival following the publication of Richard Whately's Elements of Logic in 1826. The book itself was the subject of a debate that would spur both De Morgan and George Boole to action. On the one hand, argued by William Whewell, logic, particularly syllogism as emphasized by Whately, could not arrive at "new truths" and was therefore inferior to and distinct from scientific reasoning; on the other hand, argued by the Scottish philosopher Sir William Hamilton, Whately's effort to equate logic to a "grammar for reasoning" was wrong and reductive. De Morgan, perhaps influenced by the writings of Sylvestre François Lacroix, saw the utility of Whately's logic in mathematics, both in its emphasis on the syllogism and in its grammar-like abstraction, as evidenced in his own writings on educationTemplate:Sfn Template:Sfn and in his demand for the inclusion of logic in the Cambridge curriculum.Template:Sfn

De Morgan's paper "On the structure of the syllogism",Template:Sfn published in 1846, mathematically defines the rules of Aristotelian logic, specifically syllogism, and including what are now known as De Morgan's laws. Historically significant as the inception of mathematical logic,Template:Sfn at the time, De Morgan's paper initiated a dispute with Hamilton over the role of mathematics in logic; "mathematics can not conduce to logical habits at all," Hamilton would write. The dispute would focus on the so-called quantification of the predicate, which Hamilton claimed, but as the dispute wore on in the pages of the Athenæum and in the publications of the two writers, it became apparent that Hamilton and his supporters were wrong and that De Morgan's mathematically precise description of Aristotle's logic was correct. On realizing this, Hamilton would claim that De Morgan had committed plagiarism.Template:Sfn Template:Efn

Boole, a friend of De Morgan's since 1842, motivated in part by the disputes between Whewell and Hamilton and De Morgan and Hamilton, would write The Mathematical Analysis of Logic, published in 1847 on the same day as De Morgan's Formal Logic. Boole's work would eclipse De Morgan's and come to define early mathematical logic. De Morgan continued to support Boole's efforts, proofreading and advocating for Boole's work. Upon Boole's death, De Morgan worked to ensure Boole's family received a government pension.Template:Sfn Template:Sfn

The Ladies College in Bedford Square

Recruited by Elizabeth Jesser Reid, in 1849 De Morgan taught mathematics for one year at the newly founded Ladies College in Bedford Square.Template:Sfn

Ramchundra and Indian mathematics

In 1850 De Morgan received a book from John Elliot Drinkwater Bethune, A Treatise on Problems of Maxima and Minima, written and self-published by the self-taught Indian mathematician Ramchundra. De Morgan was so struck by the work that he entered into correspondence with Ramchundra and arranged for the book's re-publication in London in 1859, targeting a European audience; De Morgan's preface surveyed classical Indian mathematical thought and urged a contemporary return of Indian mathematics:Template:Sfn Template:Sfn Template:Sfn Template:Blockquote

The influence of classical Indian logic on De Morgan's own work on logic has been speculated upon.^[5] Mary Boole, claimed a profound influence—via her uncle George Everest—of Indian thought in general and Indian logic, in particular, on her husband George Boole, as well as on De Morgan:

Think what must have been the effect of the intense Hinduizing of three such men as Babbage, De Morgan, and George Boole on the mathematical atmosphere of 1830–65. What share had it in generating the vector analysis and the mathematics by which investigations in physical science are now conducted?^[6]

London Mathematical Society

Arthur Cowper Ranyard and George Campbell De Morgan, De Morgan's son, conceived the idea of founding a mathematical society in London, where mathematical papers would be not only received (as by the Royal Society) but also read and discussed. The first meeting of the London Mathematical Society was held at University College in 1865. De Morgan was the first president and his son was the first secretary. The earliest members included Benjamin Gompertz, De Morgan's personal friend and fellow actuary, William Stanley Jevons and James Joseph Sylvester, De Morgan's former students, Thomas Archer Hirst, De Morgan's colleague, and mathematicians William Kingdom Clifford and Arthur Cayley.^[7]Template:Sfn

Personal life

Family

Augustus was one of seven children, only four of whom survived to adulthood. These siblings were Eliza (1801–1836), who married Lewis Hensley, a surgeon living in Bath; George (1808–1890), a barrister-at-law who married Josephine, daughter of Vice Admiral Josiah Coghill, 3rd Baronet Coghill; and Campbell Greig (1811–1876), a surgeon at the Middlesex Hospital.

When De Morgan moved to London, he befriended William Frend (1757–1841). Both had studied mathematics at Cambridge and subsequently left for religious reasons, and both were actuaries. In the autumn of 1837, De Morgan married Sophia Elizabeth Frend (1809–1892), the eldest daughter of William Frend and Sarah Blackburne (1779–?), a granddaughter of Francis Blackburne (1705–1787), Archdeacon of Cleveland.^[8]

De Morgan had three sons and four daughters, including fairytale author Mary De Morgan. His eldest son was the potter William De Morgan, who would marry the painter Evelyn De Morgan, nee Pickering. His second son, George, acquired distinction in mathematics at University College and the University of London.

Personality

De Morgan was full of personal peculiarities. On the occasion of the installation of his friend, Lord Brougham, as Rector of the University of Edinburgh, the Senate offered to confer on him the honorary degree of LL. D.; he declined the honor as a misnomer. He humorously described himself using the Latin phrase 'Homo paucarum literarum' (man of few letters), reflecting his modesty about his extensive contributions to mathematics and logic.

He disliked the provinces outside London, and while his family enjoyed the seaside and men of science were having a good time at a meeting of the British Association in the country, he remained in the hot and dusty libraries of the metropolis. He said that he felt like Socrates, who declared that the farther he was from Athens, the farther he was from happiness.

He never sought to become a Fellow of the Royal Society and he never attended a meeting of the Society. He said that he had no ideas or sympathies in common with the physical philosopher; his attitude was possibly due to his physical infirmity, which prevented him from being either an observer or an experimenter.Template:Sfn

He never voted at an election, and he never visited the House of Commons, the Tower of London, or Westminster Abbey.Template:Sfn

Religious views

Despite a strict Church of England upbringingTemplate:Sfn De Morgan was publicly a non-conformist, at some personal cost: His refusal to conform debarred him from further advancement at Cambridge; his marriage was without Church ceremony;Template:Sfn and on several occasions he fought with the University College administration to maintain religious neutrality,Template:Sfn eventually resigning over the issue.Template:Sfn In private De Morgan was a dissenter: He married into a Unitarian family, where his essentially Christian deist interpretations of scripture were welcome.Template:Sfn Later in life he would lean more deist and join Martineau's Free Christian Union.Template:Sfn

De Morgan was on occasion accused of atheismTemplate:Sfn which he dismissed as sectarianism.Template:Efn Template:Sfn In his will De Morgan would write Template:Blockquote

Retirement and death

At age 60, De Morgan's pupils secured him a pension of £500 p.a., but misfortunes followed. Two years later, his son George—the "younger Bernoulli," as Augustus loved to hear him called,Template:Sfn in allusion to the eminent father-and-son mathematicians of that name—died. This blow was followed by the death of a daughter. Five years after his resignation from University College, De Morgan died of nervous prostration on 18 March 1871.

Mathematics

De Morgan is best known for his pioneering contributions to mathematical logic, specifically algebraic logic, and, to a lesser extent, for his contributions to the beginnings of abstract algebra.

Mathematical logic

De Morgan's contributions to logic are two-fold. Firstly, before De Morgan there was no mathematical logic—logic, including formal logic, was the domain of philosophers; De Morgan was the first to make formal logic a mathematical subject. Secondly, De Morgan would develop the calculus of relations, essentially abstracting logic via the application of algebraic principles.

De Morgan's first original paper on logic, "On the structure of the syllogism",Template:Sfn appeared in the Transactions of the Cambridge Philosophical Society in 1846. The paper describes a mathematical system that formalizes Aristotelian logic, specifically the syllogism. While the rules De Morgan defines, including the eponymous De Morgan's laws, are straightforward, the formalism is significant: it represented the first serious instance of mathematical logic, which would come to pervade the field of logic, and presaged logic programming.Template:Sfn The subsequent dispute with the philosopher Sir William Stirling Hamilton over the "quantification of the predicate" referred to in De Morgan's paper would lead George Boole to write the pamphlet Mathematical Analysis of Logic (1847). De Morgan elaborated upon his initial paper in the book Formal Logic, or the Calculus of Inference, Necessary and Probable (1847),Template:Sfn published the same week as Boole's pamphlet and was immediately overshadowed by it. Nonetheless, later practitioners would recognize the pioneering nature of his work; C. I. Lewis wrote, "His originality in the invention of new logical forms, his ready wit, his pat illustrations, and clarity and liveliness of his writing did yeoman service in breaking down the prejudice against the introduction of 'mathematical' methods into logic".^[9]

De Morgan developed the calculus of relations in his paper "On the syllogism, No. IV"Template:Sfn and in his book Syllabus of a Proposed System of Logic (1860).Template:Sfn He showed that reasoning with syllogisms could be replaced with the composition of relations.Template:Sfn The calculus was described as the logic of relatives by Charles Sanders Peirce, who admired De Morgan and met him shortly before his death. Historians trace several developments in modern logic directly to De Morgan's contributions to algebraic logic: "Any serious attempt to study the contemporary work of Tarski or Birkhoff should begin with a serious study of the most significant founders of their field, especially Boole, De Morgan, Pierce and Schröder".^[10] In fact, a theorem articulated by De Morgan in 1860 was later expressed by Schrŏder in his textbook on binary relations, and is now commonly called Schröder rules.

Abstract algebra

De Morgan was an early convert and supporter of Peacock's symbolical algebra but soon grew disillusioned. Starting in 1839, De Morgan authored a series of papers "On the foundation of algebra",Template:Sfn Template:Sfn Template:Sfn Template:Sfn describing what he called "logical" or "double" algebra, essentially an early form of geometric algebra. While these papers are perhaps most notable for their influence on Sir William Rowan Hamilton and the development of quaternions,Template:Sfn Template:Sfn they are also recognized to contain De Morgan's steps towards a fully abstract algebra:

"Inventing a distinct system of unit-symbols, and investigating or assigning relations which define their mode of action on each other".^[11]

De Morgan summarized and extended his algebraic work in his book Trigonometry and Double Algebra (1849).Template:Sfn

Works

De Morgan was a prolific writer; an incomplete list of his works occupies 15 pages of his memoirs.Template:Sfn While most of his mathematical writing is educational in nature, consisting of various textbooks, it is for his pioneering contributions to logic for which he is best known, presented in several books and papers, notably Formal Logic (1847) and Syllabus of a Proposed System of Logic (1860). His work on algebra is also of note, in particular Trigonometry and Double Algebra (1849).

De Morgan was also a well known popularizer of science and mathematics; he contributed over 600 articles to the Penny Cyclopedia, ranging from Abacus to Young, Thomas.Template:Sfn His most unusual work is A Budget of Paradoxes, a compilation of his writing, mostly book reviews, for The Athenæum Journal.

Algebra

While De Morgan's two early works on algebra are instructional, his translation of Bourdon's The Elements of Algebra (1828)Template:Sfn and his own textbook The Elements of Algebra (1835),Template:Sfn the issues he encountered while writing them would spur his later research.Template:Sfn

De Morgan's research papers on algebra, presented in a sequence of four in the Transactions of the Cambridge Philosophical Society from 1839 to 1844 titled "On the foundation of algebra",Template:Sfn Template:Sfn Template:Sfn Template:Sfn defined what De Morgan called "logical" or "double" algebra. While the papers are most notable for their influence on Hamilton and quaternions,Template:Sfn No. IITemplate:Sfn includes the definition of what are now called fields Template:Sfn and No. IVTemplate:Sfn handles the case of "triple" algebra which eluded Hamilton.Template:Sfn

De Morgan's book Trigonometry and Double Algebra (1849)Template:Sfn consists of a treatise on trigonometry and a synthesis of his earlier work on algebra, tracing the development of "double" algebra, essentially geometric algebra, from arithmetic through symbolical algebra, illustrated throughout with the construction of the complex numbers.Template:Sfn De Morgan enumerates the laws that define an algebraic structure, in an early instance of what Whitehead would call universal algebra. While De Morgan notably omits Gregory's associative law, the selective application of laws, e.g., commutativity, is what led to Hamilton's quaternions.Template:Sfn Template:Sfn Also of note is the introduction of hyperbolic functions and comparison of circular and hyperbolic trigonometry.Template:Sfn

Logic

De Morgan's first work on logic, First Notions of Logic (1839), is pedagogical, introducing students to the necessary logic to study Euclid's Elements.

De Morgan's first research paper on logic, "On the structure of the syllogism" (1846),Template:Sfn describing a mathematical system for Aristotlean syllogism, arguably marks the beginning of so-called mathematical logic.Template:Efn

Perhaps De Morgan's best known work, Formal Logic, or the Calculus of Inference, Necessary and ProbableTemplate:Sfn was published in 1847 in the same week (by arrangement) as George Boole's Mathematical Analysis of Logic. The book is primarily a reissue of his paper "On the structure of the syllogism" (1846)Template:Sfn but also includes his earlier book, First Notions of Logic (1839),Template:Sfn chapters on fallacies and probability, and the details of his dispute with the Scottish philosopher Sir William Hamilton.

De Morgan continued his research on logic in a series of papers,Template:Sfn Template:Sfn Template:Sfn Template:Sfn most notably "On the syllogism, No. IV" (1860),Template:Sfn which introduced the logic of relations. De Morgan synthesizes much of this work in his book Syllabus of a Proposed System of Logic (1860).Template:Sfn

A Budget of Paradoxes

Published posthumously in 1872, A Budget of Paradoxes is a compilation of De Morgan's column of the same name for the Athenæum, consisting mostly book reviews and focusing on so-called paradoxers, also referred to as pseudomaths (a De Morgan neologism) and pseudoscientists.Template:Sfn

The pseudomaths De Morgan describes are mostly circle-squarers, such as Thomas Baxter,Template:Sfn cube-duplicators, and angle-trisectors. One such angle-trisector was James Sabben, whose work received a one-line review from De Morgan: Template:Blockquote

Another pseudomath identified by De Morgan was James Smith, a successful merchant of Liverpool, who claimed that $π = 3 \frac{1}{8}$ . De Morgan writes:

Template:Blockquote

Among the many pseudoscientific ideas De Morgan discredits are Alfred Wilks Drayson's expanding Earth theoryTemplate:Sfn and Samuel Rowbotham's Zetetic Astronomy, or the flat Earth theory.Template:Sfn

In his discussion of calculations of $π$ , De Morgan discusses at length Buffon's approximation and his own results using the method.Template:Sfn

De Morgan gives space to non-technical subjects in Budget as well, religion in particular. De Morgan gives a favorable review of Godfrey Higgins' Anacalypsis Template:Sfn and provides several anecdotes about the views of great mathematicians on religion, notably Laplace Template:Sfn and Euler.Template:Sfn

De Morgan frequently displays humor in Budget, including various anagrams such as, "Great Gun, do us a sum!" (="Augustus De Morgan"),Template:Sfn The Astronomer's Drinking Song,Template:Sfn Template:Sfn and the poem Siphonaptera.Template:Sfn Budget was well-received but hard to categorize.Template:Efn Template:Sfn Template:Sfn

Spiritualism

Later in his life, De Morgan developed an interest in spiritualism. Initially intrigued by clairvoyance, he conducted paranormal investigations with the American medium Maria Hayden. The results of these investigations are documented in the book From Matter to Spirit: The Result of Ten Years Experience in Spirit Manifestations (1863), written by Sophia De Morgan and published anonymously to avoid repercussions.Template:Sfn

Sophia was likely a convinced spiritualist, but De Morgan himself was neither a firm believer nor a skeptic. He maintained that the methodology of the physical sciences does not automatically exclude psychic phenomena, suggesting that such phenomena might eventually be explained by natural forces not yet identified by physicists.Template:Sfn In the preface to From Matter to Spirit (1863), De Morgan writes: Template:Blockquote

De Morgan was one of the first notable scientists in Britain to take an interest in the study of spiritualism, influencing William Crookes to also study spiritualism.Template:Sfn

Legacy

The headquarters of the London Mathematical Society are called De Morgan House, and the top prize awarded by the Society is the De Morgan Medal.

The student society of the Mathematics Department of University College London is called the Augustus De Morgan Society.

De Morgan's extensive library of mathematical and scientific works, many historical, was acquired by Samuel Jones-Loyd for the University of London and is now part of the Senate House Libraries collection.Template:Sfn

The lunar crater De Morgan is named after him.

Publications

Books

Journal articles

References

External links

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↑ De Morgan, (1838) Induction (mathematics), The Penny Cyclopedia.
↑ ^2.0 ^2.1 ^2.2 Template:Cite web
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↑ C. I. Lewis (1918) Survey of Symbolic Logic, page 37, via Internet Archive
↑ Irving Anellis & Nathan R. Hauser (1991) "Nineteenth century roots of algebraic logic and universal algebra", in Algebraic Logic, editors Hajnal Andréka, J.D. Monk, & I. Nemeti, Janos Bolyai Mathematical Society
↑ A. N. Whitehead (1898) Universal Algebra, page 131

[1] De Morgan, (1838) Induction (mathematics), The Penny Cyclopedia.

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[9] C. I. Lewis (1918) Survey of Symbolic Logic, page 37, via Internet Archive

[10] Irving Anellis & Nathan R. Hauser (1991) "Nineteenth century roots of algebraic logic and universal algebra", in Algebraic Logic, editors Hajnal Andréka, J.D. Monk, & I. Nemeti, Janos Bolyai Mathematical Society

[11] A. N. Whitehead (1898) Universal Algebra, page 131

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