-

(- <z1> …) given two or more arguments - returns the difference of its arguments, associating to the left.

Given one argument - returns the “additive inverse” of its argument.

No argument may be supplied, in that case - will return 0.

Example:

[1] (-)
0
[2] (- 3)
-3
[3] (- 6 2)
4
[4] (- 6 2.0)
4.0
[5]