The New Encyclopædia BritannicaEncyclopædia Britannica, 1992 |
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Page 243
... valid , irrespective of whether the premises are true or false . Other ways of expressing the fact that an inference is deductively valid are to say that the truth of the premises gives ( or would give ) an absolute guarantee of the ...
... valid , irrespective of whether the premises are true or false . Other ways of expressing the fact that an inference is deductively valid are to say that the truth of the premises gives ( or would give ) an absolute guarantee of the ...
Page 245
... valid wff's of that system ( sometimes simply called the decision problem for the system ) . This is the problem of finding an effective proce- dure , in the sense explained in Formation rules for PC , for testing the validity of any ...
... valid wff's of that system ( sometimes simply called the decision problem for the system ) . This is the problem of finding an effective proce- dure , in the sense explained in Formation rules for PC , for testing the validity of any ...
Page 250
... valid — the validity of an unlimited number of such wff's can in fact be demonstrated — but it does mean that in the case of LPC , unlike that of PC , no advance as- surance can be given that no matter what wff is produced it will ...
... valid — the validity of an unlimited number of such wff's can in fact be demonstrated — but it does mean that in the case of LPC , unlike that of PC , no advance as- surance can be given that no matter what wff is produced it will ...
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