reconsider e = jj as Element of F_Real ;
take e ; :: according to GROUP_1:def 1 :: thesis: for b₁ being Element of the carrier of F_Real holds
( b₁ * e = b₁ & e * b₁ = b₁ )
thus for b₁ being Element of the carrier of F_Real holds
( b₁ * e = b₁ & e * b₁ = b₁ ) ; :: thesis: verum