"A personality is a full Congress of orators and pressure-groups, of children, demagogues, communists, isolationists, war-mongers, mugwumps, grafters, prayer-meetings, spiritualists, and astrologers."
数学是给不同事物赋予相同名称的艺术。
我们要去猎熊。我们要抓一只大的。多么美好的一天！我们不怕。
The essence of mathematics is not to make simple things complicated, but to make complicated things simple.