Nullary

Nullary Sometimes it is useful to consider a constant to be an operation of arity 0, and hence call it nullary.

In the nullary case, one can derive truth from no premises.

One combines a Latin prefix with the -ary ending; for example: * A nullary function takes no arguments.

Polyadic or multiary means n-ary for some nonnegative integer n. A 0-ary, or nullary, quasigroup is just a constant element of Q. A 1-ary, or unary, quasigroup is a bijection of Q to itself.