fundamental region

fundamental region

[¦fən·də¦ment·əl ′rē·jən]
(mathematics)
Any region in the complex plane that can be mapped conformally onto all of the complex plane.
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They begin by describing Hecke's main correspondence theorem and establish a couple of useful lemmas, then work through a fundamental region.
The Directory is complemented by highlighted sponsor listings from carefully selected institutions and editorial focusing on Ukraine and Russia - two fundamental regions for investment.

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