indefinite metric space
A mathematical term from functional analysis and differential geometry. Refers to a space equipped with a metric that is not positive definite, allowing for null or negative distances.
Indefinite metric spaces are also important as a mathematical foundation for general relativity.
計量空間 (metric space) requires a positive definite metric, while 不定計量空間 relaxes this condition.
Compound of 不定 (indefinite) + 計量 (metric) + 空間 (space). A direct calque of the English mathematical term 'indefinite metric space'.