Pioneer of propositional logic
Chrysippus studied "if…then…" inference and built the most complete formal logic of antiquity — not surpassed until Frege and Russell two thousand years later.
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Chrysippus
The "second founder" of Stoicism, master logician
Remembered for a Single Line · Small Roles, Famous Names
StoicismLogicFate
Who they are
Chrysippus (c. 279–206 BC), third head of the Stoa, systematized the school’s logic, physics and ethics — the ancients said "without Chrysippus there would be no Stoa." His propositional logic outran Aristotle’s term logic and was only rediscovered by modern logicians.
Primary sourcesDiogenes Laërtius, LivesStoicorum Veterum Fragmenta (SVF)
Key stories
Relationships
Mentor
Echoes today
Below are how modern works borrow or reinterpret this name or story — not the original material. The two differ, so keep them apart.
Propositional logicHis "if…then" inference is now recognized as a pioneer of modern logic.