New posts in Fundamental Groups

Can the fundamental group detect all ways to not have a section?

Fundamental group of Klein Bottle

Fundamental group of $\{\text{diag}(A,B) \colon A,B \in SO(2)\} /\{I,-I\}$

Fundamental group of mapping cone of quotient map from suspension to reduced suspension

The fundamental group(s) of $\Bbb Q$ and of $\Bbb R$.

Fundamental group of the space $\Bbb CP^n-p(X)$

Comparison between Van Kampen theorem from Allen Hatcher and "Introduction to knot theory".

Fundamental group of the real projective plane and its universal cover

How can I visualise the fundamental group of the projective plane?

Can I use Seifert-van Kampen theorem infinite times