Aristotelian logic, after a great and early triumph, consolidated its position of influence to rule over the philosophical world throughout the Middle Ages up until the 19th Century.

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A deductive argument is an argument in which it is thought that the premises provide a guarantee of the truth of the conclusion.

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Propositional logic, also known as sentential logic and statement logic, is the branch of logic that studies ways of joining and/or modifying entire propositions, statements or sentences to form more complicated propositions, statements or sentences, as well as the logical relationships and propert

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A fallacy is a kind of error in reasoning. The alphabetical list below contains 209 names of the most common fallacies, and it provides brief explanations and examples of each of them. Fallacies should not be persuasive, but they often are.

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To Our Venerable Brethren the Patriarchs, Primates, Archbishops, Bishops, and other ordinaries of places having Peace and Communion with the Apostolic See.

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Venn diagrams or set diagrams are diagrams that show all possible logical relations between a finite collection of sets (aggregation of things). Venn diagrams were conceived around 1880 by .

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Set theory is the branch of mathematical logic that studies sets, which are collections of objects. Although any type of object can be collected into a set, set theory is applied most often to objects that are relevant to mathematics.

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