miniapl

— Under

f⌾g Y is g⁻¹(f(g Y)). X f⌾g Y is g⁻¹((g X)f(g Y)).

3 (+⌾(2∘×))4       ⍝ 7
(⌽⌾(1∘+))1 2 3    ⍝ 3 2 1
⌊⌾(10∘×)⊢1.25     ⍝ 1.2

Call order: g Y, g X, f, inverse g.

DOMAIN: unknown inverse. See Inverse pair.