《孙子算经》三卷,案《隋书·经籍志》有《孙子算经》二卷,不著其名,亦不著其时代。《唐书·艺文志》称李淳风注甄鸾《孙子算经》三卷。於孙子上冠以甄鸾,盖如淳风之注《周髀算经》,因鸾所注更加辨论也。《隋书》论审度引《孙子算术》,蚕所生吐丝为忽,十忽为秒,十秒为毫,十毫为厘,十厘为分,本书乃作十忽为一丝,十丝为一毫。又论嘉量引《孙子算术》,六粟为圭,十圭为秒,十秒为撮,十撮为勺,十勺为合。本书乃作十圭为一撮,十撮为一秒,十秒为一勺。考之夏侯阳《算经》引田曹、仓曹亦如本书,而《隋书》中所引与史传往往多合。盖古书传本不一,校订之儒各有据证,无妨参差互见也。唐之选举,算学孙子、五曹共限一岁习肄,於後来诸算术中特为近古,第不知孙子何许人。朱彝尊《曝书亭集·五曹算经跋》云,相传其法出於孙武,然孙子别有《算经》,考古者存其说可尔。又有《孙子算经》跋云,首言度量所起,合乎兵法地生度,度生量,量生数之文。次言乘除之法设为之数,十三篇中所云廓地、分利、委积、远输、贵贱、兵役、分数比之《九章》方田、粟米、差分、商功、均输、盈不足之目,往往相符,而要在得算多,多自然胜。以是知此编非伪托也云云。合二跋观之,彝尊之意盖以为确出於孙武。今考书内设问有云,长安洛阳相去九百里。又云,佛书二十九章,章六十三字,则後汉明帝以後人语。孙武春秋末人,安有是语乎?旧本久佚。今从《永乐大典》所载裒集编次,仍为三卷。其甄、李二家之注则不可复考,是则姚广孝等割裂刊削之过矣。
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