Hello.

I'd like to know how to solve the following problem: $\displaystyle \mathbb{R}P^2$#$\displaystyle T^2=\mathbb{R}P^2$#$\displaystyle K^2$ , where $\displaystyle \mathbb{R}P^2$ is the real projective plane, $\displaystyle T^2$ is the torus and $\displaystyle K^2$ is the Klein bottle.