Sentence examples for a true proposition from inspiring English sources

The propositional negation of a true proposition is a false proposition.

The thrust of (5) is the proposition that no matter what object we supply as argument, the propositional function $x$ is self-identical will map it into a true proposition.

Necessity, in logic and metaphysics, a modal property of a true proposition whereby it is not possible for the proposition to be false and of a false proposition whereby it is not possible for the proposition to be true.

Intuitively, a wff of LPC is valid if and only if all its instances are true i.e., if and only if every result of replacing each of its free variables appropriately and uniformly is a true proposition.

(1918, p. 25) Is a fact just a true proposition?

And, we have shown that this sentence says something true, and so expresses a true proposition.

In the right circumstances, a speaker could use (26) to assert a true proposition.

The whole Truth is a true proposition that is also complete: it entails all true propositions.

According to the identity theory, a true proposition is identical to a fact.

Thus (p_{(1.0, 0.0)}) can be read as a true proposition.

We can reason that if the Liar sentence fails to express a proposition, it fails to express a true proposition.