Search results

...e-claims-to-have-glimpsed-universe-before-big-bang|url-status=dead}}</ref> Penrose popularized this theory in his 2010 book [[Cycles of Time (book)|''Cycles o ..."arxiv.org2010">{{cite arXiv|eprint=1011.3706|author1=Gurzadyan VG|author2=Penrose R|title=Concentric circles in WMAP data may provide evidence of violent pre ...

...its Gödel sentence, while [[Mind|human minds]] can. Mathematician [[Roger Penrose]] modified the argument in his first book on [[consciousness]], ''[[The Emp ...theorems can be listed by an algorithm that has a Gödel sentence, but the Penrose-Lucas argument tries to prove otherwise: our ability to [[Understanding|und ...

As studied by Smale, a dynamical system comprises a [[manifold]] <math>M</math> and a [[s ...ey.edu/events_series_bowen.html [Retrieved 20 October 2009]</ref> [[Roger Penrose]] gave the talks in 2002-3 and [[Edward Witten]] lectured in 2006–7. ...

...ysics for algebraists: non-commutative and non-cocommutative Hopf algebras by a bicrossproduct construction|journal= J. Algebra|volume= 130 |year=1990|pa ...book of essays ''On Space and Time'' along with [[Alain Connes]], [[Roger Penrose]], [[John Polkinghorne]], [[Michal Heller]] and Andrew Taylor, in which the ...

Calculations in the [[Newman–Penrose formalism|Newman–Penrose (NP) formalism]] of [[general relativity]] normally begin with the '''const ...–Penrose formalism)|Ricci-NP scalars]] <math>\Phi_{ij}</math> and [[Newman–Penrose formalism#Maxwell-NP scalars.2C Maxwell equations in NP formalism|Maxwell-N ...

...rocured from observations, as would be farther necessary for that purpose. By the Rev. John Michell, B.D. F.R.S. In a letter to Henry Cavendish, Esq. F.R ...mple of a cosmological model with an event horizon is a universe dominated by the [[cosmological constant]] (a [[de Sitter universe]]). ...

...nsion (mathematics)|central extension]] of the group of spatial symmetries by the group with two elements. [[Hans Bethe]] introduced the term "[[double g ...operation separate from the identity operation; the double group is formed by combining these two symmetry operations with a [[point group]] such as a [[ ...

{{quote|This is a 1 followed by about three hundred thousand zeroes ... Even if such a machine were to oper ...one, some, or all of the possible sequences of nondeterministic decisions, by enumerating states after each possible decision. ...

...p {{math|PSU(1,1)}}, the quotient of the special unitary group [[SU(1,1)]] by its center {{math|{''I'', −''I''<nowiki>}</nowiki>}}. ...n than the original work of Beltrami.<ref>{{cite book|last1=Penrose|first1=Roger|title=The Road To Reality: A Complete Guide to the Laws of the Universe|url ...

...oi=10.1103/PhysRev.71.38}}.</ref> Snyder's [[Lie algebra]] was made simple by [[C. N. Yang]] in the same year. ...al fields between the observer and the star, as in the deflection of light by the sun, one of the classic tests of [[general relativity]]. Therefore, the ...

In [[physics]], [[time]] is defined by its [[operational definition|measurement]]: time is what a [[clock]] reads. ...istic physics, it is a [[scalar (physics)|scalar]] quantity (often denoted by the symbol <math>t</math>) and, like [[length]], [[mass]], and [[electric c ...

...book)|A Briefer History of Time]]''|[[Penrose–Hawking singularity theorems|Penrose–Hawking theorems]]|[[Black hole information paradox]]|[[Micro black hole]]| ...ating device]], initially through use of a handheld switch, and eventually by using a single cheek muscle.<ref>Stephen Hawking: An inspirational story of ...

...inciple]] (also known as the principle of least action). It was introduced by the Italian-French mathematician and astronomer [[Joseph-Louis Lagrange]] i ...=2019PRPER..15b0126L |hdl=1808/29610 |hdl-access=free }}</ref> This method works well for many problems, but for others the approach is ...

...a [[Dürer's solid|truncated rhombohedron]], while measurement is indicated by the scales and [[hourglass]].<ref name=Ziegler/>]] ...I.2005.14|pmid=15628272 |citeseerx=10.1.1.58.8477 |s2cid=13387519 }}</ref> by [[Paolo Uccello]]. 15th century]] ...

...ian Studies in the Philosophy and History of Science: An Account of Recent Works |series=Boston Studies in the Philosophy of Science |publisher=Springer |is ...verse]]'' by [[James Hopwood Jeans]] and ''[[Mr Tompkins in Wonderland]]'' by [[George Gamow]].<ref name=":0">{{Cite web |last=Freire |first=Olival |date ...

...arshall|first1=William| last2=Simon|first2=Christoph| last3=Penrose|first3=Roger| last4=Bouwmeester|first4=Dik| date=2003-09-23|title=Towards Quantum Superp ...h>\omega'=\omega</math>. Inelastic scattering, in contrast, is accompanied by excitation or de-excitation of the material object (e.g. internal atomic tr ...

* Activity from the [[Mesolithic]] period onwards, attested by archaeological finds across the city.<ref name=OARA2011>{{cite web|title=Ox * By 727 – [[Dida of Eynsham]] establishes a nunnery with [[Frithuswith|Frideswi ...

...natural forces such as [[Wind power|wind]] and [[Water power|water]], and by [[Chemical energy|chemical]], [[Thermal energy|thermal]], or [[electrical]] ...computer [[algorithm]]s that improve automatically through experience and by the use of data.<ref>{{Cite book|last=Mitchell|first=Tom|url=http://www.cs. ...

...icae (Mercator) 007.jpg|Atlas]] It was made in 1574, when Mercator was 62, by the engraver [[Frans Hogenberg]] who contributed many of the topographical ...the [[Mercator projection]]. While the map's geography has been superseded by modern knowledge, its projection proved to be one of the most significant a ...