Algosim documentation: ∈

∈ (element of)

Tests for set membership.



If a is any object and A a set, then a ∈ A returns true iff a is an element of A.

If the cardinality of A is reasonably small, floating-point values are compared individually with epsilon. However, if the cardinality is very large, a different algorithm may be used to improve performance, which may not be epsilon-based.

The operator is implemented by the ElementOf function.


A ≔ {−1, 0, 1}
{1, −1, 0}
sin(π) ∈ A

See also