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obversion

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obversion
obversion (əbˈvɜːʃən) [ad. L. obversiōn-em, n. of action from obvertĕre to obvert.] 1. The action of turning towards some person or thing.1864 in Webster. 2. Logic. A form of immediate inference in which, by changing the quality, from one proposition another is inferred, having a contradictory predi... Oxford English Dictionary
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Obversion
In traditional logic, obversion is a "type of immediate inference in which from a given proposition another proposition is inferred whose subject is the Because of this, obversion can be used to determine the immediate inferences of all categorical propositions, regardless of quality or quantity. wikipedia.org
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Contraposition (traditional logic)
Contraposition also has philosophical application distinct from the other traditional inference processes of conversion and obversion where equivocation The successive applications of conversion and obversion within the process of contraposition may be given by a variety of names. wikipedia.org
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obvertend
obvertend Logic. (ˈɒbvəˌtɛnd) [ad. L. obvertend-us, gerundive of obvertĕre: see obvert v.] The proposition to be obverted.1886 P. K. Ray Text-bk. Deductive Logic (ed. 2) iii. ii. 129 The given proposition may be called the Obvertend. 1896 [see obversion 2]. Oxford English Dictionary
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obvert
obvert, v. (əbˈvɜːt) [ad. L. obvert-ĕre to turn towards or against, f. ob- (ob- 1 a, b) + vertĕre to turn.] † 1. trans. To turn (something) towards; to place fronting. Obs.1623 Cockeram, Obuert, to turne against one. 1646 Sir T. Browne Pseud. Ep. vi. vii. 309 The rooms of cænation in the Summer, he ... Oxford English Dictionary
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Inverse (logic)
See also Contraposition Converse (logic) Obversion Transposition (logic) Notes Immediate inference wikipedia.org
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obverse
obverse, a. and n. (see below) [ad. L. obversus, pa. pple. of obvertĕre to obvert. Single instances of the adj. and n. are known in 17th c.; otherwise the word is not exemplified till end of 18th c.; neither Johnson nor Todd has it, though giving obversant; under reverse, of coins, Chambers Cycl. (1... Oxford English Dictionary
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Converse (logic)
See also Aristotle Categorical proposition#Conversion Contraposition Converse (semantics) Inference Inverse (logic) Logical connective Obversion wikipedia.org
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Transposition (logic)
, a series of immediate inferences where the rule of obversion is first applied to the original categorical proposition "All S is P"; yielding the obverse In the obversion of the original proposition to an 'E' type proposition, both terms become distributed. wikipedia.org
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permutation
permutation (pɜːmjuːˈteɪʃən) [a. OF. permutacion (14th c. in Hatz.-Darm.), ad. L. permūtātiōn-em, n. of action f. permūtāre to permute.] † 1. Exchange of one thing for another; interchange; commutation; barter. Obs.1362 Langl. P. Pl. A. iii. 242 In Marchaundise nis no Meede, I may hit wel avoue; Hit... Oxford English Dictionary
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infinitation
infinitation Logic. (ɪnfɪnɪˈteɪʃən) [ad. Schol.L. infīnītātio (Abelard Dialectica 225), n. of action from infīnītāre: see prec.] The action of infinitating or making ‘infinite’; the condition of being infinitated; hence, applied to one of the forms of immediate inference, also called permutation or ... Oxford English Dictionary
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Categorical proposition
Obversion Obversion changes the quality (that is the affirmativity or negativity) of the statement and the predicate term. It is also equivalent to converting (applying conversion) the obvert (the outcome of obversion) of a categorical statement. wikipedia.org
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换质换位律
换质（obversion）是指将 改为 换位（conversion）是指将 改为 换质换位（contraposition）是指将 改为 在直言命题中，换质换位律只能用于全称肯定型（A型）和特称否定型（O型），而不能用在全称否定型（E型）和特称肯定型（I型）；套用在后者是非法的换质换位 wikipedia.org
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ob-
ob-, prefix The Lat. prep. ob ‘in the direction of, towards, against, in the way of, in front of, in view of, on account of’. In combination with vbs. and their derivatives, the b is assimilated to certain consonants, becoming oc- before c-, of- before f-, op- before p-, and app. o- before m- (in om... Oxford English Dictionary
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Square of opposition
The Square of Oppositions was used for the categorical inferences described by the Greek philosopher Aristotle: conversion, obversion and contraposition wikipedia.org
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