The interplay between discrete and continuous mathematics is where some of the most interesting problems lie.

The writer's only responsibility is to his art. He will be completely ruthless if he is a good one... If a writer has to rob his mother, he will not hesitate; the "Ode on a Grecian Urn" is worth any number of old ladies.

每张皮革都承载着两个历史：动物的生命和制革者的遗产。我们对两者都负有责任。