āhuatanga pūmau
1. (noun) invariant property (maths).
He whakaatanga tēnei. Ka noho pūmau te āhua me te rahi, ka rerekē te wāhi noho me te ahunga. Ka kīia, he āhuatanga pūmau te koki me te rahi i raro i te whakaatanga, he āhuatanga taurangi te ahunga me te taunga (TRP 2010:191). / This is a reflection. The shape and size remain unchanged, but the position and orientation is changed. It is said that the angle and size under the reflection are invariant properties, but the orientation and position are variant properties.
