Chapter 1, "Truth," opens with a reference to the Stoic Chrysippus' maxim that "every assertible
is either true or false" (p.
95--"If" and "then," wrapped around enough content to form at least two propositions that seem to be conditionally assertible
together as antecedent and consequent, are, of course, the key denizens of this very deep work.
It is then suggested that the argument trades on an ambiguity in "justified" and "warrantedly assertible
To understand a statement is to know under what, circumstances that statement is warrantedly assertible