#1
Let R be a ring where .
If (i) R is commutative and (ii) 1+1 and 1+1+1 have inverse in R (1 is unity in R), show that |R|=1.
#2
is the set of all polynomials whose the sum of even degree coefficients is 0 and the sum of odd degree coefficients is 0.
True/False? Explain it!
Thanks for your help