Validity and Truth

Relation between truth and validity

Truth and validity are qualitatively different in meaning, and it’s a categorical mistake to confuse or use them interchangeably. Hopefully, budding logicians like you won’t make that mistake after this lesson. It’s important to remember the following:

• Propositions are true/false.

• Arguments are valid/invalid.

Propositions don’t use the currency of valid/invalid, and arguments aren’t discussed as true/false. ...