Original sentence: In mathematics, in semigroup theory, a Rees factor semigroup (also called Rees quotient semigroup) is a certain semigroup constructed using a semigroup and an ideal of the semigroup
Edited sentence: In mathematics, in semigroup theory, a Rees factor semigroup (also called Rees quotient semigroup or just Rees factor) is a certain semigroup constructed using a semigroup and an ideal of the semigroup