⌈
⌈Y rounds up. Pervasive; tolerant near integers. Complex ceiling is -⌊-Y.
⌈Y
-⌊-Y
⌈1.2 ¯1.2 ⍝ 2 ¯1 ⌈3r2 ⍝ 2x
X⌈Y takes the real maximum. Pervasive. Empty reduction identity: ¯∞.
X⌈Y
¯∞
3⌈1 5 ⍝ 3 5