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Page 244

It is assumed that every proposition is either

is both

propositions. The function of an operator is to form a new proposition from one or

more ...

It is assumed that every proposition is either

**true**or false and that no propositionis both

**true**and false. Truth and falsity are said to be the truth values ofpropositions. The function of an operator is to form a new proposition from one or

more ...

Page 247

Formation rules 2 and 3 of Formation rides for PC are therefore replaced by the

rule that if a and ft are w//'s, (a~D ft) is a wff. As in ordinary PC, p D q is interpreted

as "p materially implies #"; i.e., as

Formation rules 2 and 3 of Formation rides for PC are therefore replaced by the

rule that if a and ft are w//'s, (a~D ft) is a wff. As in ordinary PC, p D q is interpreted

as "p materially implies #"; i.e., as

**true**except when p is**true**but q false.Page 266

In so doing, the logician gives a branch of science a formal language in which

there are logically

more ...

In so doing, the logician gives a branch of science a formal language in which

there are logically

**true**sentences having universal logical ranges and factually**true**sentences having universal logical ranges and factually**true**ones havingmore ...

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