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The first step in liquidating a people is to erase its memory. Destroy its books, its culture, its history. Then have somebody write new books, manufacture a new culture, invent a new history. Before long the nation will begin to forget what it is and what it was. The world around it will forget even faster.

在數學中，最深刻的思想往往源于最簡單的觀察。

了解這個世界就是愛它，而愛它就是為它哀傷。