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[toc] Description Given two strings a and b we define $a b$ to be their concatenation. For example, if a = "abc" and b = "def" then $a b$ = "abcdef". 阅读全文
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[toc] Description The Genographic Project is a research partnership between IBM and The National Geographic Society that is analyzing DNA from hundred 阅读全文
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[toc] Description The French author Georges Perec (1936–1982) once wrote a book, La disparition, without the letter 'e'. He was a member of the Oulipo 阅读全文
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