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  2. Syllogism - Wikipedia

    en.wikipedia.org/wiki/Syllogism

    Syllogistic arguments are usually represented in a three-line form: All men are mortal. ... the symbols mean that the first term ("square") is the middle term, the ...

  3. Term logic - Wikipedia

    en.wikipedia.org/wiki/Term_logic

    o = does not belong to some. Categorical sentences may then be abbreviated as follows: AaB = A belongs to every B (Every B is A) AeB = A belongs to no B (No B is A) AiB = A belongs to some B (Some B is A) AoB = A does not belong to some B (Some B is not A) From the viewpoint of modern logic, only a few types of sentences can be represented in ...

  4. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.

  5. Glossary of logic - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_logic

    A proposition that asserts or denies that all or some of the members of one category are included in another category, fundamental in syllogistic reasoning. categorical syllogism A form of deductive reasoning in Aristotelian logic consisting of three categorical propositions that involve three terms and deduce a conclusion from two premises ...

  6. List of valid argument forms - Wikipedia

    en.wikipedia.org/wiki/List_of_valid_argument_forms

    It does not leave the user with one statement alone at the end of the argument, instead, it gives an option of two different statements. The first premise gives an option of two different statements. Then it states that if the first one happens, there will be a particular outcome and if the second happens, there will be a separate outcome.

  7. Fallacy of four terms - Wikipedia

    en.wikipedia.org/wiki/Fallacy_of_four_terms

    The fallacy of four terms is a syllogistic fallacy. Types of syllogism to which it applies include statistical syllogism, hypothetical syllogism, and categorical syllogism, all of which must have exactly three terms. Because it applies to the argument's form, as opposed to the argument's content, it is classified as a formal fallacy.

  8. Logic - Wikipedia

    en.wikipedia.org/wiki/Logic

    The discipline of semantics studies the meaning of language. Formal semantics uses formal tools from the fields of symbolic logic and mathematics to give precise theories of the meaning of natural language expressions. It understands meaning usually in relation to truth conditions, i.e. it examines in which situations a sentence would be true ...

  9. Hypothetical syllogism - Wikipedia

    en.wikipedia.org/wiki/Hypothetical_syllogism

    The rule of hypothetical syllogism holds in classical logic, intuitionistic logic, most systems of relevance logic, and many other systems of logic.However, it does not hold in all logics, including, for example, non-monotonic logic, probabilistic logic and default logic.