≤ — Decrement / Less equal

Function. Keys: Alt-<. Ranks: 0 monadic, 0 0 dyadic

≤Y is Y-1. Pervasive.

≤[1 2 3]ₓ         ⍝ [0 1 2]ₓ

X≤Y tests whether X is less than or equal to Y, for real numbers. Pervasive; tolerant.

1 2 3≤2            ⍝ $t $t $f

Inverse

≤⁻¹Y increments Y.

≤⁻¹4   ⍝ 5