Rigidity (mathematics)
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This article is about mathematical objects that are uniquely determined by small amounts of information. For the mathematical study of rigid bodies, see structural rigidity.
In mathematics, a rigid collection C of mathematical objects (for instance sets or functions) is one in which every c ∈ C is uniquely determined by less information about c than one would expect. The above statement does not define a mathematical property; instead, it describes in what sense the adjective "rigid" is typically used in mathematics, by mathematicians.