# Documentation for infix (<)

Documentation for infix (<), assembled from the following types:

# language documentation Sets, Bags, and Mixes

## (Sets, Bags, and Mixes) infix (<)

multi sub infix:<<(<)>>(Any , Any --> Bool)multi sub infix:<<(<)>>(Setty , Setty --> Bool)

Returns `True`

if `$a`

is a **strict subset** of `$b`

, i.e., that all the elements of `$a`

are elements of `$b`

but `$a`

is a smaller set than `$b`

.

### infix ⊂

only sub infix:<⊂>(, --> Bool)

Subset of operator (alternate).

Equivalent to (<), at codepoint U+2282 (SUBSET OF).

### infix ⊄

only sub infix:<⊄>(, --> Bool)

Equivalent to `!(<)`

, at codepoint U+2284 (NOT A SUBSET OF).