paradox
A paradox is an assertion that is apparently self-contradictory, though based on a valid deduction
from acceptable premises
.
Paradoxes typically lead to a reevaluation of the axioms of mathematics. after axioms are assumed so that the paradox is averted, the statement is still usually referred to as a paradox.
Occasionally, one may refer to a surprising result as a paradox. Such is the case in the birthday paradox, which is not apparently self-contradictory.
Examples of paradoxes include:
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Banach-Tarski paradox
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binary tree paradox
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birthday paradox (http://planetmath.org/BirthdayParadox)
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Burali-Forti paradox
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Cantor’s paradox
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Hausdorff paradox
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Russell’s paradox
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Simpson’s paradox
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Zeno’s paradox