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  2. Categorical proposition - Wikipedia

    en.wikipedia.org/wiki/Categorical_proposition

    The study of arguments using categorical statements (i.e., syllogisms) forms an important branch of deductive reasoning that began with the Ancient Greeks. The Ancient Greeks such as Aristotle identified four primary distinct types of categorical proposition and gave them standard forms (now often called A, E, I, and O).

  3. Syllogism - Wikipedia

    en.wikipedia.org/wiki/Syllogism

    A syllogism (Ancient Greek: συλλογισμός, syllogismos, 'conclusion, inference') is a kind of logical argument that applies deductive reasoning to arrive at a conclusion based on two propositions that are asserted or assumed to be true.

  4. List of valid argument forms - Wikipedia

    en.wikipedia.org/wiki/List_of_valid_argument_forms

    In syllogistic logic, there are 256 possible ways to construct categorical syllogisms using the A, E, I, and O statement forms in the square of opposition. Of the 256, only 24 are valid forms. Of the 24 valid forms, 15 are unconditionally valid, and 9 are conditionally valid.

  5. Hypothetical syllogism - Wikipedia

    en.wikipedia.org/wiki/Hypothetical_syllogism

    An invalid hypothetical syllogism either affirms the consequent (fallacy of the converse) or denies the antecedent (fallacy of the inverse). A pure hypothetical syllogism is a syllogism in which both premises and the conclusion are all conditional statements. The antecedent of one premise must match the consequent of the other for the ...

  6. Glossary of logic - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_logic

    A standard form of categorical syllogism in Aristotelian logic, where all three propositions (major premise, minor premise, and conclusion) are universal affirmatives, symbolized as AAA. The form is: All M are P, All S are M, therefore All S are P. [ 28 ] [ 29 ] [ 30 ]

  7. Philosophy of psychology - Wikipedia

    en.wikipedia.org/wiki/Philosophy_of_psychology

    Related to the philosophy of psychology are philosophical and epistemological inquiries about clinical psychiatry and psychopathology. Philosophy of psychiatry is mainly concerned with the role of values in psychiatry: derived from philosophical value theory and phenomenology , values-based practice is aimed at improving and humanizing clinical ...

  8. Term logic - Wikipedia

    en.wikipedia.org/wiki/Term_logic

    A syllogism is an argument that consists of at least three sentences: at least two premises and a conclusion. Although Aristotle does not call them "categorical sentences", tradition does; he deals with them briefly in the Analytics and more extensively in On Interpretation. [4]

  9. Fallacy of four terms - Wikipedia

    en.wikipedia.org/wiki/Fallacy_of_four_terms

    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.