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Please consider removing the tag 4d. It is a new tag and has only one question, which is about cube in 4d.
On one hand, it is definitely not necessary to have the tag $nd$ for all $n\in \mathbb N$. More importantly, four dimensional manifold has a special role in differential geometry, so the t...
Compute the fundamental group of a five - pointed star ( boundary plus interior ).
Knowing that I have taken only chapter 1 & 2 of " introduction to knot theory " of Richard H. Crowell and Ralph H. Fox.
Which includes the fundamental group of the circle but does not include van Kampen theorem....
