noun
nonstandard analysis
A branch of mathematics that rigorously defines infinitesimals using hyperreal numbers. Technical term used in academic contexts.
超準解析は、無限小を厳密に扱う数学の一分野です。
Nonstandard analysis is a branch of mathematics that rigorously handles infinitesimals.
From 超 (chō, 'super' or 'beyond') + 準 (jun, 'quasi' or 'semi') + 解析 (kaiseki, 'analysis'), a calque of English 'nonstandard analysis'.