Combinators: Dual/Under Index   <<   >>

 
 
f⍢g ⍵
gi f g ⍵		   ⍺ f⍢g ⍵
gi (g⍺)f(g⍵)


 

Iverson, Operators and Functions, 1978-04-26; Section 8.

Hui et al., http://www.jsoftware.com/jwiki/Essays/Under