The New Encyclopaedia Britannica: Macropaedia (19 v.)Encyclopaedia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 39
Deductive validity Inference forms Valid proposi- tion forms Problems in the philosophy of logic Funda- mental definitions Decision. I. Introduction Probably the most natural approach to formal logic is through the idea of the soundness ...
Deductive validity Inference forms Valid proposi- tion forms Problems in the philosophy of logic Funda- mental definitions Decision. I. Introduction Probably the most natural approach to formal logic is through the idea of the soundness ...
Page 42
... valid , the inference form " a , therefore ẞ " is likewise valid . This fact is easily seen from the fact that a means the same as " Not both : a and not - ẞ " ; for , as was noted in the Introduction , whenever the latter is a valid ...
... valid , the inference form " a , therefore ẞ " is likewise valid . This fact is easily seen from the fact that a means the same as " Not both : a and not - ẞ " ; for , as was noted in the Introduction , whenever the latter is a valid ...
Page 44
... valid in PC . Some wff's that are valid in PC are , however , now no longer valid . An example is ( p \ ~ p ) , which , when p has the value 1⁄2 , also has the value 2. This reflects the idea that if one admits the possibility of a ...
... valid in PC . Some wff's that are valid in PC are , however , now no longer valid . An example is ( p \ ~ p ) , which , when p has the value 1⁄2 , also has the value 2. This reflects the idea that if one admits the possibility of a ...
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19th century army atoms axiomatic axioms bearings became BIBLIOGRAPHY body centre century church dipoles Dutch economic electric electrons energy example ferromagnetic Figure fluid flux density force France French friction function gears German helium-3 Holland important industry King known land later Lo-yang load lock locomotion loess logic logicians logistic London Louis Low Countries lubricant luminescence Luther Lutheran Luxembourg lymph lymph nodes lymphatic Macau machines Mackenzie River Madagascar Madhya Pradesh magic magnesium magnetic field magnetic moment material mechanical ment metal metres miles modal modal logic motion move movement Netherlands nodes nuclear operations particles percent political population predicate produced propositions provinces River rotation rule screw shaft speed square stadholder surface syllogisms temperature theorem theory tion tool torque towns types United valid variables velocity wff's