I don't have any particular recipe [for developing new proofs] ... It is the reason why doing research is challenging as well as attractive. It's like being lost in a jungle and trying to use all the knowledge that you can gather to come up with some new tricks, and with some luck you might find a way out.
每个人出生时都是许多人,死去时却只是一个人。
系统不是一个生产系统,而是一个消费系统。