Segal's lemma. Its formulation and proof.
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Series of problems in Probability Theory
In several papers a result called Segal's lemma appears. This
result is Lemma~1.4 in I.~E.~Segal's paper Construction of nonlinear
local quantum processes~I. in Annals of Math.~92 (1970) 462--481.
Here I describe a slightly modified and more detailed formulation
and proof of this result. I present a slighly different version of
Segal's proof. I finish this note with the original
formulation and proof of Segal's result.
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