Laurent’s theorem guarantees a doubly infinite series expansion
for a complex function f(z) with an isolated singularity at a in ℂ. The residue of f(z) at a equals c–1. See Cauchy’s residue theorem.
1. The material remaining after boiling off the volatile liquid in a mixture containing solids or high boiling-point liquids.
2. The distillation of all but the heaviest components from liquid materials such as crude oil.
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