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Euclid: Elementa

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1. A magnitude is a part of a magnitude, the less of the greater, when it measures the greater.
lat Clavius
No Latin
kin 幾何原本 p. 211-212
第一界
分者。幾何之幾何也。小能度大。以小為大之分。
以小幾何、度大幾何。謂之分。曰幾何之幾何者。謂非此小幾何。不能為此大幾何之分也。如一點無分。亦非幾何。卽不能為線之分也。一線無廣狹之分。非廣狹之幾何。卽不能為面之分也。一面無厚薄之分。非厚薄之幾何。卽不能為體之分也。曰能度大者。謂小幾何、度大幾何。能書大之分者也。如甲、為乙、為丙、之分。則甲為乙三分之一。為丙六分之一。無贏、不足也。若戊為丁之一、卽贏。為二、卽不足。己為丁之三、卽贏。為四、卽不足。是小不書大。則丁不能為戊、己、之分也。以數明之。若四於八、於十二、於十六、於(p. 二一二)二十、諸數。皆能盡分。無贏、不足也。若四於六、於七、於九、於十、於十八、於三十八、諸數。或贏、或不足。皆不能盡分者也。本書所論。皆指能盡分者。故稱為分。若不盡分者。當稱幾分幾何之幾。如四於六。為三分六之二。不得正名為分。不稱小度大也。不為大幾何內之小幾何也。
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