New posts in geometric-topology

What are the 8 non-compact Euclidean 3-manifolds?

manifolds geometric-topology

Does the Euler characteristic of a manifold depend upon the field of coefficients?

general-topology algebraic-topology geometric-topology

Homology 4-balls with boundary $S^3$

algebraic-topology geometric-topology low-dimensional-topology

Torus is the only closed orientable surface regularly covered by punctured plane

group-theory algebraic-topology geometric-topology covering-spaces free-groups

Generalized Jordan-Brower separation theorem

algebraic-topology differential-topology geometric-topology

For an $n$-dimensional object, how many types of holes are possible?

general-topology geometric-topology low-dimensional-topology dimension-theory-analysis

Characterization of $\mathbb{R}^n$?

manifolds differential-topology smooth-manifolds geometric-topology

Is the fundamental group of non orientable surface Fuchsian?

group-theory algebraic-topology riemann-surfaces geometric-topology non-orientable-surfaces

Can someone give an example of a non-differentiable manifold?

geometric-topology

The Join of Two Copies of $S^1$

general-topology algebraic-topology quaternions geometric-topology

Are there exotic balls?

general-topology algebraic-topology manifolds smooth-manifolds geometric-topology

Euler characteristic 1: Half a hole?

geometric-topology

Length of the main diagonal of an n-dimensional cube

calculus geometry geometric-topology

Fractional versions of euclidean space?

euclidean-geometry geometric-topology dimension-theory-analysis

Maps from $D^n$ to $D^n$ with a single inverse set are open.

general-topology algebraic-topology metric-spaces geometric-topology

Why is the knot group of the trefoil isomorphic to the group of 3-braids?

geometric-topology geometric-group-theory knot-theory

In how many dimensions is the full-twisted "Mobius" band isotopic to the cylinder?

general-topology geometric-topology mobius-band

Gluing a solid torus to a solid torus with annulus inside.

algebraic-topology homology-cohomology geometric-topology

Orientation reversing diffeomorphism

algebraic-topology geometric-topology

About degree of a smooth map between Manifolds

differential-geometry differential-topology geometric-topology