Thematic
Logic in the 19th century
The nineteenth century was one of the most active periods for logic in Western philosophy. It is regarded foremost as being the first time logic became ‘symbolic’ and ...
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Thematic
Logic machines and diagrams
By ‘logical diagrams’ we generally mean any two-dimensional representations of logical relationships, such as of class inclusion or consequence. One usually also means representations using non-typographical symbols or ...
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Overview
Logic, philosophy of
Philosophy of logic can be roughly characterized as those philosophical topics which have emerged either from the technical development of symbolic (mathematical) logic, or from the motivations that ...
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Biographical
De Morgan, Augustus (1806–71)
Augustus De Morgan was an important British mathematician and logician. Much of his logical work was directed to expanding the traditional syllogistic theory, and to meeting the objections ...
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Biographical
Venn, John (1834–1923)
John Venn was a British symbolic logician and methodologist of science. He is known for having invented the method of Venn diagrams for judging the validity of categorical ...
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Biographical
Boole, George (1815–64)
George Boole, a British mathematician, is credited with making a fundamental contribution to modern logic. If Leibniz’s manuscript essays on logic, effectively unknown until the end of the ...
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Thematic
Predicate calculus
The predicate calculus is the dominant system of modern logic, having displaced the traditional Aristotelian syllogistic logic that had been the previous paradigm. Like Aristotle’s, it is a ...
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Biographical
Royce, Josiah (1855–1916)
Josiah Royce rose from a humble background in the California of the Gold Rush period to become Professor of the History of Philosophy at Harvard University and one ...
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Biographical
Trendelenburg, Friedrich Adolf (1802–72)
Trendelenburg was a philosopher, Aristotelian scholar and legal theorist who was known primarily because of his close critical analyses of Aristotle and his attempts to find a middle ...
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Biographical
Frege, Gottlob (1848–1925)
A German philosopher-mathematician, Gottlob Frege was primarily interested in understanding both the nature of mathematical truths and the means whereby they are ultimately to be justified. In general, ...
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Biographical
Poincaré, Jules Henri (1854–1912)
Although primarily a mathematician, Henri Poincaré wrote and lectured extensively on astronomy, theoretical physics, philosophy of science and philosophy of mathematics at the turn of the century. In ...
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Biographical
Peirce, Charles Sanders (1839–1914)
Peirce was an American philosopher, probably best known as the founder of pragmatism and for his influence upon later pragmatists such as William James and John Dewey. Personal ...
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