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特異点 (数学)
Wikipedia definition
1. Mathematical singularityIn mathematics, a singularity is in general a point at which a given mathematical object is not defined, or a point of an exceptional set where it fails to be well-behaved in some particular way, such as differentiability. See Singularity theory for general discussion of the geometric theory, which only covers some aspects. For example, the function on the real line has a singularity at x = 0, where it seems to "explode" to ±∞ and is not defined.
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