0 votes 0 votes Can the following operation be used with a non empty set to represent a group? a*b=sqrt($a^{2}+b^{2}$) My doubt is,does this operation represents a function or do we include +- sign both as output ? Mathematical Logic discrete-mathematics group-theory + – rahul sharma 5 asked Jun 10, 2017 rahul sharma 5 398 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.