noun which may take the genitive case particle 'no'
unipotent
Mathematical term used in group theory and linear algebra to describe an element or matrix where some power equals the identity. Domain-specific; not used in general language.
べき単行列は、ある冪で単位行列になる。
A unipotent matrix becomes the identity matrix at some power.
この群の元はすべてべき単である。
All elements of this group are unipotent.
べき零 (nilpotent) refers to an element where some power equals zero, whereas べき単 (unipotent) refers to an element where some power equals the identity.
Compound of 冪 (べき, 'power') and 単 (たん, 'single'), referring to the property that a single power yields the identity. The exact historical derivation is uncertain; the term is a modern mathematical coinage.