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...of [[geometry]] in terms of analysis, and the invention of [[set theory]] by [[Georg Cantor|Cantor]], eventually led to the much more general modern con ...pringer Science & Business Media|isbn=978-3-540-65340-0|pages=154–}}</ref> By 1718, he came to regard as a function "any expression made up of a variable ...

...ther. It includes the study of the nature of the fundamental concepts used by logic and the relation of logic to other disciplines. According to a common ...nce, so the philosophy of logic investigates philosophical problems raised by logic.<ref name="Haack1">{{cite book |last1=Haack |first1=Susan |title=Phil ...

...r example, complex propositions are made up of simpler propositions linked by [[Logical connective|logical vocabulary]] like <math>\land</math> ([[Logica ...ts roots in the work of late 19th-century mathematicians such as [[Gottlob Frege]]. Today, the most commonly used system is [[classical logic]]. It consists ...

...s boundless, endless, or larger than any [[natural number]]. It is denoted by <math>\infty</math>, the [[infinity symbol]]. ...19th century, [[Georg Cantor]] enlarged the mathematical study of infinity by studying [[infinite set]]s and [[transfinite number|infinite number]]s, sho ...