noun
differential coefficient
Mathematical term for the derivative of a function at a point; used in calculus contexts.
微系数を求めるには微分の公式を使います。
To find the differential coefficient, we use differentiation formulas.
Compound of 微 (び, 'minute, slight') and 系数 (けいすう, 'coefficient'), referring to a coefficient related to infinitesimal change. The exact historical derivation is uncertain; the term is a technical calque from Western mathematics.