The phrase "a proposition could be" is correct and usable in written English.
It can be used when discussing the potential nature or characteristics of a proposition in a theoretical or philosophical context.
Example: "In this debate, a proposition could be formulated to challenge the existing beliefs about morality."
Alternatives: "an assertion might be" or "a statement could potentially be".
A proposition could be known immediately one way and yet, in another way, follow as a conclusion of a sound deductive argument.
Lewis had little positive to say about how we knew a proposition explicating our concepts to be true, and thus how a proposition could be known a priori.
There may well be difficulties of explaining how a proposition could be part of more than one concrete world (and why it would only be part of some concrete worlds but not all), but this framework seems to make conceptual room for the possibility propositions being true at worlds without being true in them.
Some Medieval philosophers supposed that the fact that true propositions are of the two sorts "necessarily true" and "contingently true" (and the corresponding fact about false propositions) showed that there were two "modes" in which a proposition could be true (or false): the mode of contingency and the mode of necessity hence the term 'modality'modality
But very roughly, the identification of facts with true propositions left them unable to see what a false proposition could be other than something which is just like a fact, though false.
He no longer believed that the truth of a general proposition could be reduced simply to the facts or complexes making its instances true.
To examine this, a testable proposition could be stated as follows: P1: Firms adopting the SSQI approach attain higher performance than those who adopt the TQM approach.
According to Russell, it is unnecessary to suppose that there exists any special sort of fact corresponding to molecular propositions; the truth-value of a molecular proposition could be entirely derivative on the truth-values of its constituents (PLA, 209).
Some commenters both on Twitter and Facebook argued Leitch's proposition could be a slippery slope to a more relaxed grip on weapons of other kinds in Canada.
In short, the entire Clementi proposition could be a flawed fix.
In his discussion of this concept, he pointed out that holding an attitude (belief, denial, withholding) in one proposition could be more reasonable for a certain subject than holding some attitude (belief, denial, withholding) in another proposition.
