91色情片

How do mathematicians do it? How does anyone think creatively? Jacques
Hadamard鈥攊n the midst of war and behaviourism鈥攕et out to find the
answer by introspection and produced the classic The Mathematician鈥檚 Mind
(Princeton University Press, 拢9.75/$12.95, ISBN 0 691 02931 8). He
quoted Henri Poincar茅; prefiguring Dawkins鈥檚 memes and himself, in 1945,
anticipated Douglas Hofstadter. He could probably lay some claim to the next
good idea about ideas to come along.