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### D.11.2 `math` library predicates

There is one binary predicate, `islessequal`, and several unary predicates, `isinfinite`, `isnan`, `isnormal`, `isubnormal` and `iszero`.

The predicate `islessequal` takes a pair of floating point numbers `(x,y)` as an argument, and returns `nil` for a false result and `(nil,nil)` for a true result.

The unary predicates have the obvious interpretations as classification functions, and should probably be used in preference to comparison with constants in case the representations aren’t unique.

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