例文
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- Other functions have essential singularities, such as at.
- Hence it is an isolated singularity, as well as being an essential singularity.
- Also for essential singularities, residues often must be taken directly from series expansions.
- For infinity is not a fixed point but an essential singularity and there is no Boettcher isomorphism.
- has an essential singularity at the origin, and hence is not even continuous, much less analytic.