``add x y``

``sub x y``

``mul x y``

``div x y``

``atan2 x y``

``abs x``

``neg x``

``floor x``

``ceil x``

``round x``

``trunc x``

``sqr x``

``sqrt x``

``pow x``

``exp x``

``log x``

``log2 x``

``log10 x``

``sigmod x``

``signum x``

``relu x``

``sin x``

``cos x``

``tan x``

``asin x``

``acos x``

``atan x``

``sinh x``

``cosh x``

``tanh x``

``asinh x``

``acosh x``

``atanh x``

``is_nan x`` returns ``true`` if ``x`` is ``nan``.

``is_inf x`` returns ``true`` if ``x`` is ``infinity`` or ``neg_infinity``.

``is_odd x`` returns ``true`` if ``x`` is odd.

``is_even x`` returns ``true`` if ``x`` is even.

``is_pow2 x`` return ``true`` if ``x`` is integer power of 2, e.g. 32, 64, etc.

``same_sign x y`` returns ``true`` if ``x`` and ``y`` have the same sign, otherwise it returns ``false``. Positive and negative zeros are special cases and always returns ``true``.

``is_simplex x`` checks whether ``x`` is simplex. In other words, :math:`\sum_i^K x_i = 1` and :math:`x_i \ge 0, \forall x_i \in 1,K`.

``is_sqr x`` checks if ``x`` is the square of an integer.

``is_prime x`` returns ``true`` if ``x`` is a prime number. The function is deterministic for numbers below 341550071728321, then becomes probabilistic for those above. The function uses Rabin–Miller primality test.

``fermat_fact x`` performs Fermat factorisation over ``x``, i.e. into two roughly equal factors. ``x`` must be an odd number.