What is the difference between the compact U(1) group and non-compact U(1) group?
2813
What is (meant by) a non-compact $U(1)$ Lie group?
137761
Why are the fundamental and anti-fundamental representation in $\text{SL}(2,\mathbb{C})$ not equivalent?
126089
Showing $U(20)$ is not cyclic: Is my proof correct?
141642
Closure of a certain subset in a compact topological group
14652
Proof a $(2n-1)$-compact manifold
9612
Frattini subgroup $Φ ( G )$ is not trivial
74978
How the center of a non-cyclic free Group is trivial?
36631
Is $[0,1] \cap \Bbb Q$ a compact subset of $\Bbb Q$?
156636
The Existence of the $^1D$ term and the non-existence of the $^3D$ term?
62635
Prove that the additive group $ℚ$ is not isomorphic with the multiplicative group $ℚ^*$.
29538
Does a non-abelian semigroup without identity exist?
1990
Results for elements in Dihedral Groups: $x \notin \langle r\rangle  \Rightarrow rx = xr^{-1}$
41408
Which of the following sets are compact:
31002
Proving that the unit ball in $\ell^2(\mathbb{N})$ is non-compact
41363
when is f@g not the same as f[g]?
73113
Groups and Symmetries
27300
Is there a 1-1 correspondence between symmetry and group theory?