"1864-03-17Z"^^ . . "1947-02-04Z"^^ . . . "1947Z"^^ . . . "Korselt, Alwin Reinhold"@en . . . "Alwin Reinhold Korselt (17 March 1864 in Mittelherwigsdorf \u2013 4 February 1947 in Plauen) was a German mathematician. He discovered Korselt's Criterion which provides a definition for Carmichael numbers and also contributed an early result in relational algebra."@en . "German mathematician" . "Alwin Reinhold Korselt"@en . "1864Z"^^ . .