(Klein) (18491925) , 20 . - . . . (1905), -. (1913), . (1865, 1868). . . .. (1872), (1875), (1880), ( 1886 ), ( 1890). . "Mathematische Annalen" (18761914), .. (18981918), " " ( 1898, ). : " " (1872), " " (1882), " " " " (18901912, , . .), " " (18981910, , . .), " " (18981934, ), " " (1908), " 19 " (1925) . . , , , . . " ", " -
463
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, ". . " ". ., . , .., ". , , ". 1908 . "" " ", " ". . " , , . ". , " , , ". " 19 " . 19 . 20 .: " . , , . , ". . , , . . - - .; , , - . ( ) .. .. . , " , , , , , , ". . , " , , , , , ... -
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464
, ".
C.B.