let a, b be Element of F_Real; :: thesis: ( a <> 0. F_Real implies ex x being Element of F_Real st x * a = b )
assume a <> 0. F_Real ; :: thesis: ex x being Element of F_Real st x * a = b
then ex x being Element of F_Real st a * x = b by Lm2;
hence ex x being Element of F_Real st x * a = b ; :: thesis: verum