New posts in Eilenberg Maclane Spaces

What is the "natural homomorphism" in the definition of an *essential manifold*?

Specific examples of Eilenberg-Maclane spaces?

Is it true that $K(G \ast H, 1) = K(G,1)\vee K(H,1) $?

$\pi_n(X^n)$ free Abelian?

Eilenberg-Maclane space $K(G\rtimes H, 1)$ for a semi-direct product.