這段改編自 2010 年 2 月 7 日的對話。
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（LWT：如果又要溫習，又想打籃球的話，我應該怎麼辦？）
那你先溫習，之後才打籃球。
（LWT：為什麼呢？）
你溫完習後，仍然會有心機打籃球。但是你打完籃球後，不會有心機溫習。
— Me@2010.05.31
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2010.05.31 Monday (c) All rights reserved by ACHK
Daily Archives: May 31, 2010
Metamathematics
Richard’s paradox (Richard 1905) concerning certain ‘definitions’ of real numbers in the English language is an example of the sort of contradictions which can easily occur if one fails to distinguish between mathematics and metamathematics.
— Wikipedia on Metamathematics
2010.05.31 Monday ACHK
Twenty-eight
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… they are big children all their life long — a kind of intermediate stage between the child and the full-grown man, who is man in the strict sense of the word.
The nobler and more perfect a thing is, the later and slower it is in arriving at maturity. A man reaches the maturity of his reasoning powers and mental faculties hardly before the age of twenty-eight; a woman at eighteen.
— Arthur Schopenhauer
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2010.05.31 Monday
Physics Town 