noun
simple proportion
Mathematical term for a direct proportional relationship between two quantities, as opposed to compound proportion.
単比例の問題は、小学校の算数でよく出てくる。
Simple proportion problems often appear in elementary school arithmetic.
複比例 is compound proportion, involving more than two quantities, whereas 単比例 involves only two.
Compound of 単 (simple, single) and 比例 (proportion). The exact historical derivation is uncertain, but the term is a straightforward technical coinage.