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最值得研究的数学事实有这样的特点,它与其他早已知道的事实有无可怀疑的联系,而被错误地认为是无关的.——亨利·庞加莱(19世纪、20世纪法国数学家)
The most worthwhile study of mathematical facts has this feature. It is in doubtable connection with other long-known facts and is erroneously regarded as irrelevant. —Henry Pogle (19th and 20th century French mathematicians )