A problem of a discrete group of smooth isometries acting discontinuously on a smooth manifold.
63098
Properly discontinuous actions and discrete groups in complete Riemannian manifolds.
118622
Local diffeomorphism from $\mathbb R^2$ onto $S^2$
135108
Why doesn't $ds^2 = 0$ imply two distinct points $p$ and $p'$ on a manifold are the same point?
57468
Continuous homorphisms between topological groups.
143269
Existence of area-preserving diffeomorphism between two sets in $\mathbb{R}^2$
58595
Existence of a G-invariant matrix
116750
On surjectivity of exponential map for Lie groups
61481
Continuously Differentiable Curves in $\mathbb{R}^{d}$ and their Lebesgue Measure
258
Existence of orthogonal coordinates on a Riemannian manifold
89649
Linear Algebra munkres analysis on manifolds question.
48369
discrete subgroups of euclidean space
10215
Differentiable manifolds as locally ringed spaces
152725
Why does $S^n$ satisfy the local $n$-slice condition? (From Lee's Smooth Manifolds)
80418
The "Easiest" non-smoothable manifold
98010
Constructing a metric on a Lie Group
82474
Isometries of $\mathbb{R}^n$
13312
Is there something similar to Noether's theorem for discrete symmetries?