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  2. Mere addition paradox - Wikipedia

    en.wikipedia.org/wiki/Mere_addition_paradox

    The mere addition paradox (also known as the repugnant conclusion) is a problem in ethics identified by Derek Parfit and discussed in his book Reasons and Persons (1984). The paradox identifies the mutual incompatibility of four intuitively compelling assertions about the relative value of populations.

  3. Logical consequence - Wikipedia

    en.wikipedia.org/wiki/Logical_consequence

    The Polish logician Alfred Tarski identified three features of an adequate characterization of entailment: (1) The logical consequence relation relies on the logical form of the sentences: (2) The relation is a priori, i.e., it can be determined with or without regard to empirical evidence (sense experience); and (3) The logical consequence ...

  4. Validity (logic) - Wikipedia

    en.wikipedia.org/wiki/Validity_(logic)

    In this case, the conclusion contradicts the deductive logic of the preceding premises, rather than deriving from it. Therefore, the argument is logically 'invalid', even though the conclusion could be considered 'true' in general terms. The premise 'All men are immortal' would likewise be deemed false outside of the framework of classical logic.

  5. Loose sentence - Wikipedia

    en.wikipedia.org/wiki/Loose_sentence

    A loose sentence (also called a cumulative sentence) is a type of sentence in which the main idea (independent clause) is elaborated by the successive addition of modifying clauses or phrases. Construction

  6. Premise - Wikipedia

    en.wikipedia.org/wiki/Premise

    A premise or premiss [a] is a proposition—a true or false declarative statement—used in an argument to prove the truth of another proposition called the conclusion. [1] Arguments consist of a set of premises and a conclusion. An argument is meaningful for its conclusion only when all of its premises are true. If one or more premises are ...

  7. Contraposition - Wikipedia

    en.wikipedia.org/wiki/Contraposition

    Conclusion: Therefore, not P; Necessity and sufficiency example. An example traditionally used by logicians contrasting sufficient and necessary conditions is the ...

  8. 30 Moments In History That Got Ghosted By Humanity - AOL

    www.aol.com/101-people-sharing-strange-history...

    However, the railroad company appealed, and in 1887, the Tennessee Supreme Court reversed the lower court's ruling, concluding that her persistence was not in good faith to obtain a comfortable ...

  9. Glossary of logic - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_logic

    A sentence formulated to express the empirical content of a theory in logical positivism, named after Rudolf Carnap and Frank P. Ramsey, aimed at separating theoretical terms from observational terms. categorical A theory is categorical if all its models are isomorphic, meaning they describe the same mathematical structures in different ways.