> On Jun 23, 2016, at 7:07 AM, Louis Chretien <lchret...@mac.com> wrote: > > R←{X} (A ⎕R B) Y
The line on the title? It’s not really the language syntax. It’s their way to tell you that ⎕R is an operator that receives required left and right operands A and B, and creates a ambivalent function that applies on right argument Y, with optional left argument X.