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・ Borel equivalence relation
・ Borel fixed-point theorem
・ Borel functional calculus
・ Borel hierarchy
・ Borel hydro-monoplane
・ Borel isomorphism
・ Borel measure
・ Borel military monoplane
・ Borel regular measure
・ Borel right process
・ Borel set
・ Borel subgroup
・ Borel summation
・ Borel Torpille
・ Borel transform
Borel's lemma
・ Borel's theorem
・ Borel, California
・ Borel-Odier Bo-T
・ Boreland
・ Borella
・ Borella (game)
・ Borella Electoral District
・ Borelli
・ Borelli v. Brusseau
・ Borello
・ Borell–Brascamp–Lieb inequality
・ Borel–Cantelli lemma
・ Borel–Carathéodory theorem
・ Borel–de Siebenthal theory


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Borel's lemma : ウィキペディア英語版
Borel's lemma
In mathematics, Borel's lemma, named after Émile Borel, is an important result used in the theory of asymptotic expansions and partial differential equations.
==Statement==
Suppose ''U'' is an open set in the Euclidean space R''n'', and suppose that ''f''0, ''f''1 ... is a sequence of smooth functions on ''U''.
If ''I'' is an any open interval in R containing 0 (possibly ''I'' = R), then there exists a smooth function ''F''(''t'', ''x'') defined on ''I''×''U'', such that
:\displaystyleF\right)(0,x) = f_k(x),}
for ''k'' ≥ 0 and ''x'' in ''U''.

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