Disjunctive syllogism

Disjunctive syllogism
Disjunctive Dis*junc"tive, a. [L. disjunctivus: cf. F. disjonctif.] 1. Tending to disjoin; separating; disjoining. [1913 Webster]

2. (Mus.) Pertaining to disjunct tetrachords. ``Disjunctive notes.'' --Moore (Encyc. of Music). [1913 Webster]

{Disjunctive conjunction} (Gram.), one connecting grammatically two words or clauses, expressing at the same time an opposition or separation inherent in the notions or thoughts; as, either, or, neither, nor, but, although, except, lest, etc.

{Disjunctive proposition}, a proposition in which the parts are connected by disjunctive conjunctions, specifying that one of two or more propositions may hold, but that no two propositions may hold at the same time; as it is either day or night.

{Disjunctive syllogism} (Logic), one in which the major proposition is disjunctive; as, the earth moves in a circle or an ellipse; but in does not move in a circle, therefore it moves in an ellipse. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Disjunctive syllogism — Rules of inference Propositional calculus Modus ponens (A→B, A ⊢ B) Modus tollens (A→B, ¬B ⊢ ¬A) …   Wikipedia

  • Disjunctive — Dis*junc tive, a. [L. disjunctivus: cf. F. disjonctif.] 1. Tending to disjoin; separating; disjoining. [1913 Webster] 2. (Mus.) Pertaining to disjunct tetrachords. Disjunctive notes. Moore (Encyc. of Music). [1913 Webster] {Disjunctive… …   The Collaborative International Dictionary of English

  • Disjunctive conjunction — Disjunctive Dis*junc tive, a. [L. disjunctivus: cf. F. disjonctif.] 1. Tending to disjoin; separating; disjoining. [1913 Webster] 2. (Mus.) Pertaining to disjunct tetrachords. Disjunctive notes. Moore (Encyc. of Music). [1913 Webster]… …   The Collaborative International Dictionary of English

  • Disjunctive proposition — Disjunctive Dis*junc tive, a. [L. disjunctivus: cf. F. disjonctif.] 1. Tending to disjoin; separating; disjoining. [1913 Webster] 2. (Mus.) Pertaining to disjunct tetrachords. Disjunctive notes. Moore (Encyc. of Music). [1913 Webster]… …   The Collaborative International Dictionary of English

  • Syllogism — A syllogism (Greek: συλλογισμός – syllogismos – conclusion, inference ) is a kind of logical argument in which one proposition (the conclusion) is inferred from two or more others (the premises) of a certain form. In antiquity, there were… …   Wikipedia

  • syllogism — /ˈsɪlədʒɪzəm / (say siluhjizuhm) noun 1. Logic an argument with two premises and a conclusion. Both the premises of a categorical syllogism are categorical propositions, containing just three distinct terms between them, e.g. all men are mortal… …  

  • disjunctive — dis•junc•tive [[t]dɪsˈdʒʌŋk tɪv[/t]] adj. 1) serving or tending to disjoin 2) gram. a) syntactically setting two or more expressions in opposition to each other, as but in poor but happy, or expressing an alternative, as or in this or that[/ex]… …   From formal English to slang

  • disjunctive — disjunctively, adv. /dis jungk tiv/, adj. 1. serving or tending to disjoin; separating; dividing; distinguishing. 2. Gram. a. syntactically setting two or more expressions in opposition to each other, as but in poor but happy, or expressing an… …   Universalium

  • Hypothetical syllogism — Rules of inference Propositional calculus Modus ponens (A→B, A ⊢ B) Modus tollens (A→B, ¬B ⊢ ¬A) …   Wikipedia

  • Paraconsistent logic — A paraconsistent logic is a logical system that attempts to deal with contradictions in a discriminating way. Alternatively, paraconsistent logic is the subfield of logic that is concerned with studying and developing paraconsistent (or… …   Wikipedia

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