commands → mods

mods(A,P)

The mods command reduces the expression A modulo the positive integer P in the symmetric range. If a denominator is not invertible mod P then null is returned.

Examples 

mods(8,5);
	-2

mods(x^2-x-2,11);
	x^2-x-2

References

Gullberg, Jan. Mathematics: From the Birth of Numbers. Norton, 1996.