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From Chinese, meaning "spear-shield." A merchant claims his spear can pierce any shield, and his shield can block any spear.

The original contradiction paradox, attributed to Han Feizi (c. 233 BCE). Two universal claims that cannot coexist: an irresistible force and an immovable object.

Omnipotence Paradox, Irresistible Force

From Epimenides the Cretan, c. 600 BCE. "All Cretans are liars."

A self-referential statement that creates a logical loop. If "this statement is false" is true, then it is false; if false, then it is true. Central to studies in formal logic and the foundations of mathematics.

Russell's Paradox, Curry's Paradox

From Plutarch's "Life of Theseus," 1st century CE.

If every component of a ship is replaced over time, is the resulting vessel the same ship? Raises fundamental questions about identity, persistence, and the nature of objects through change.

Sorites Paradox, Identity of Indiscernibles