noun
mathematical engineering
An interdisciplinary field applying mathematics to engineering problems; often contrasted with pure mathematics or theoretical physics.
彼は大学で数理工学を専攻している。
He is majoring in mathematical engineering at university.
数理工学の手法を使って最適化問題を解く。
Solve optimization problems using methods from mathematical engineering.
Compound of 数理 (mathematical principles) + 工学 (engineering). The exact historical derivation is uncertain, but the term is a modern academic designation.