Kannappan-Wilson and Van Vleck-Wilson functional equations on semigroups

Youssef Aserrar, Elhoucien Elqorachi

Let $S$ be a semigroup, $Z(S)$ the center of $S$ and $\sigma :S\to S$ is an involutive automorphism. Our main results is that we describe the solutions of the Kannappan-Wilson fu…