Abstract Algebra problem - Please show your work clearly! If we are working within a Ring, prove that a in the Ring. Solution R is a ring The binary operations are addition and multiplication.. ( R +) is an abelian group w.r.t addition 0,the additive identity is in R For all a in R,we have 1. 0+0a=0a=(0+0)a=0a+0a. By the cancellation law it now follows that 0a=0.