Chrysippus · Philosophy

The Logic of Propositions

How Chrysippus invented a logic of whole sentences, centuries before its time.

What you'll be able to recall

Chrysippus founded propositional logic: a system reasoning about whole assertibles (the Stoic ‘sayables,’ or lekta ) connected by ‘if,’ ‘and,’ ‘or.’ He laid down five basic indemonstrable argument-forms from which all valid inference could be derived - a system so powerf…

Leads to Aristotle.

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