In traditional logic the obverse of a proposition is one logically equivalent to it, formed by the operation of obversion. For the four basic forms (see syllogism ) this transforms (i) All As are B into No As are non-B; (ii) No As are B into All As are non-B; (iii) Some As are B into Some As are not non-B; and (iv) Some As are not B into Some As are non-B.

Philosophy dictionary. . 2011.

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  • Obverse — Ob verse ([o^]b v[ e]rs), n. [Cf. F. obverse, obvers. See {Obverse}, a.] 1. The face of a coin which has the principal image or inscription upon it; the other side being the {reverse}. [1913 Webster] 2. Anything necessarily involved in, or… …   The Collaborative International Dictionary of English

  • obverse — [äb vʉrs′, əbvʉrs′; ] also, and for n. always [, äb′vʉrs΄] adj. [L obversus, pp. of obvertere, to turn toward < ob (see OB ) + vertere, to turn: see VERSE] 1. turned toward the observer 2. narrower at the base than at the top [an obverse leaf] …   English World dictionary

  • obverse — ► NOUN 1) the side of a coin or medal bearing the head or principal design. 2) the opposite or counterpart of a fact or truth. ► ADJECTIVE 1) denoting the obverse of a coin or medal. 2) corresponding to something as its opposite or counterpart.… …   English terms dictionary

  • Obverse — Ob*verse ([o^]b*v[ e]rs ), a. [L. obversus, p. p. of obvertere. See {Obvert}.] Having the base, or end next the attachment, narrower than the top, as a leaf. [1913 Webster] …   The Collaborative International Dictionary of English

  • obverse — index adverse (opposite), antipode, contra, contradictory, contraposition, contrary, counterpart (com …   Law dictionary

  • obverse — (adj.) 1650s, from L. obversus, pp. of obvertere to turn toward or against, from ob toward (see OB (Cf. ob )) + vertere to turn (see VERSUS (Cf. versus)). According to OED, not in common use until the end of the 18th century. The noun, in… …   Etymology dictionary

  • obverse — n *converse, reverse …   New Dictionary of Synonyms

  • obverse — I. adjective Etymology: Latin obversus, from past participle of obvertere to turn toward, from ob toward + vertere to turn more at ob , worth Date: circa 1656 1. facing the observer or opponent 2. having the base narrower than the top < an… …   New Collegiate Dictionary

  • obverse — 1. adjective a) Turned or facing toward the observer. The obverse side of the gravestone has the inscription. b) Corresponding; complementary. When you speak clearly, people understand you. If you mumble, the obverse effect is observed …   Wiktionary

  • obverse — ob|verse [ˈɔbvə:s US ˈa:bvə:rs] n [singular] [Date: 1600 1700; : Latin; Origin: obversus, from obvertere to turn toward ] 1.) formal the opposite of a particular situation or feeling = ↑opposite obverse of ▪ The obverse of victory is defeat. 2.)… …   Dictionary of contemporary English

  • Obverse — The opposite, the opposite side, the counterpart. For example, mania is thought of as the obverse of depression just as heads is the obverse of tails on a coin …   Medical dictionary

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