**Type:**- Function
**Defined in:**- mon.c
- Returns the difference
`m1 - m2`, where`m1`and`m2`are monomials. We assume that both monomials have equal power products, otherwise the result would not be a monomial but a polynomial.*No error*is reported in this case but the result is wrong.

Thu Sep 3 14:50:07 MDT 1998