< Less Than
<= Up To

Syntax: x < y, <[x;y]
Syntax: x <= y, <=[x;y]

Returns 1b where (items of) x are less than (or up to) y.

q)(3;"a")<(2 3 4;"abc")
001b
000b
q)(3;"a")<=(2 3 4;"abc")
011b
111b

With booleans:

q)0 1 </:\: 0 1
01b
00b
q)0 1 <=/:\: 0 1
11b
01b

Greater Than, At Least
Basics: Comparison