Looking for the proof of the lemma asserting that the conical surface (envelope) is a closed space. Thank you.
Topology: Proof that a finitely generated cone is closed
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general-topology
topological-vector-spaces
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2Please give more details, so that we know what you have in mind. Also, writing complete words is usually a great idea! :) – 2011-01-08
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1If by "conical surface" you mean this: http://en.wikipedia.org/wiki/Conical_surface and if by "closed" you mean this: http://en.wikipedia.org/wiki/Closed_set then the lemma is false and there is no proof. You need some additional condition like having a closed directrix. – 2011-01-08
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0Please see my answer below. – 2011-01-08