晚清数学家戴煦对正切数的研究——兼论正切数与欧拉数的关系
만청수학가대후대정절수적연구——겸론정절수여구랍수적관계
A Study on Tangent Numbers by Mathematician Dai Xu in Late Qing Dynasty——And on relationship between Tangent Numbers and Euler Numbers
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