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1·In 1915, Einstein made a trip to Gottingen to give some lectures at the invitation of the mathematical physicist David Hilbert.

1915年，应数学物理学家大卫·希尔伯特的邀请，爱因斯坦去哥廷根做了几次演讲。

2·Hurwitz was a student of FELIX KLEIN and teacher of DAVID HILBERT.

胡尔维茨是菲利克斯·克莱因的学生和大卫·希尔伯特的老师。