∘ — Atop

Dyadic operator. Keys: Alt-t. Hanzi: 承

f∘g Y is f(g Y), and X f∘g Y is f(X g Y).

2 -∘+ 3            ⍝ ¯5

See Rank for applying a function to cells of a chosen rank.

Inverse

(f∘g)⁻Y is g⁻ f⁻ Y. X(f∘g)⁻Y is X g⁻ f⁻ Y.

(-∘÷)⁻¯0.5   ⍝ 2