The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 39
Deductive validity Inference forms Valid proposi- tion forms Decision procedure with truth tables Construc- tion of valid wff's. I. Introduction Probably the most natural approach to formal logic is through the idea of the soundness or ...
Deductive validity Inference forms Valid proposi- tion forms Decision procedure with truth tables Construc- tion of valid wff's. I. Introduction Probably the most natural approach to formal logic is through the idea of the soundness or ...
Page 42
... valid , the inference form " a , therefore ẞ " is likewise valid . This fact is easily seen from the fact that a ẞ 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 ẞ 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 Some wff's that are valid in PC are , however , now no longer valid .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 V ~ p ) , which , when p has the value 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 Some wff's that are valid in PC are , however , now no longer valid .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 V ~ p ) , which , when p has the value 2 , also has the value 2. This reflects the idea that if one admits the possibility of a ...
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applied army atoms bearings became become body called cause central centre century church complete connected continued cutting direction Dutch early effect electric electrons energy equal example expressions fact field Figure force France French function gears German give given House important increased industry Italy King known land later load logic London Louis lubricant machines magnetic major material means mechanical ment miles motion move movement natural obtained operations original period political population position possible principles problem produced properties propositions region relations remained result River rotation rule shaft speed square surface temperature theory tion tool towns true turn types United universal usually valid