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Since most of their original works -- if indeed, many writings were even produced -- are lost, we cannot make many definite claims about exactly who first made investigations into what areas of propositional logic, but we do know from the writings of Sextus Empiricus that Diodorus Cronus and his pupil Philo had engaged in a protracted debate about whether the truth of a conditional statement depends entirely on it not being the case that its antecedent (if-clause) is true while its consequent (then-clause) is false, or whether it requires some sort of stronger connection between the antecedent and consequent -- a debate that continues to have relevance for modern discussion of conditionals.The Stoic philosopher Chrysippus (roughly 280-205 BCE) perhaps did the most in advancing Stoic propositional logic, by marking out a number of different ways of forming complex premises for arguments, and for each, listing valid inference schemata.The most thoroughly researched branch of propositional logic is classical truth-functional propositional logic, which studies logical operators and connectives that are used to produce complex statements whose truth-value depends entirely on the truth-values of the simpler statements making them up, and in which it is assumed that every statement is either true or false and not both.However, there are other forms of propositional logic in which other truth-values are considered, or in which there is consideration of connectives that are used to produce statements whose truth-values depend not simply on the truth-values of the parts, but additional things such as their necessity, possibility or relatedness to one another.

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A logical operator is said to be on the truth or falsity of the statements from which they are constructed.The English words "and", "or" and "not" are (at least arguably) truth-functional, because a compound statement joined together with the word "and" is true if both the statements so joined are true, and false if either or both are false, a compound statement joined together with the word "or" is true if at least one of the joined statements is true, and false if both joined statements are false, and the negation of a statement is true if and only if the statement negated is false. One example of an operator in English that is not truth-functional is the word "necessarily".Whether a statement formed using this operator is true or false does not depend entirely on the truth or falsity of the statement to which the operator is applied.A is any word or phrase used either to modify one statement to make a different statement, or join multiple statements together to form a more complicated statement.In English, words such as "and", "or", "not", "if ...

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