List questions from algebraic-topology

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Finding a mistake using Mayer-Vietoris

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Euler characteristic and fundamental polygon

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Homotopy fixed point on the fibre of a fibration over BG

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When you cut a projective planes you get a cylinder?

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Čech cohomology of a contractible space with integer coefficients

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Isomorphism between fundamental groups by attaching $n$-cell

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Is a torus homeomorphic to a cylinder?

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Concluding that $\mathbb{R}P^2$ cannot be embedded in $S^3$

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Fundamental theorem of algebra using degree theory

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Classification of finite flat maps from $X$ to $\mathbb P^n$

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How to interpret the structure of elements in a path-connected topological group.

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When one can extend $X\times \{0,1\}\cup A\times[0,1]\rightarrow Y$ to full homotopy?

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Does Singular complex determine a topological space

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The Numbers Four and Seven

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List Question

Whitehead product $[i_2, i_2]_W$

Finding a mistake using Mayer-Vietoris

Euler characteristic and fundamental polygon

Homotopy fixed point on the fibre of a fibration over BG

When you cut a projective planes you get a cylinder?

Čech cohomology of a contractible space with integer coefficients

Isomorphism between fundamental groups by attaching $n$-cell

Is a torus homeomorphic to a cylinder?

Concluding that $\mathbb{R}P^2$ cannot be embedded in $S^3$

Fundamental theorem of algebra using degree theory

Classification of finite flat maps from $X$ to $\mathbb P^n$

How to interpret the structure of elements in a path-connected topological group.

When one can extend $X\times \{0,1\}\cup A\times[0,1]\rightarrow Y$ to full homotopy?

Does Singular complex determine a topological space

The Numbers Four and Seven

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