bn:01234813n
Noun Concept
JA
ヒルベルトの第21問題  ヒルベトの第二十一問題
EN
The twenty-first problem of the 23 Hilbert problems, from the celebrated list put forth in 1900 by David Hilbert, concerns the existence of a certain class of linear differential equations with specified singular points and monodromic group. Wikipedia
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