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Acta Mathematica Academiae Paedagogicae Nyíregyháziensis, Vol. 19, No. 2, pp. 167-174 (2003)
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Proportion theory in greek mathematics

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László Filep

College of Nyíregyháza, Hungary

**Abstract:**
The concepts of ratio, equal ratio, proportion played an important role in ancient Greek mathematics. The Book V of Euclid's Elements contains a proportion theory of (geometrical) magnitudes based on the equal ratio definition of Eudoxus (Definition V.5). In this paper we study both the pre-Eudoxian theory of proportion, and the genesis of Eudoxus's definition.

**Keywords:** Proportion theory, same ratio definition, Eudoxus, incommensurability.

**Classification (MSC2000):** 01A20

**Full text of the article:**

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