faithful representation related to the center
125742
$\phi \times \theta$ is faithful iff $(|Z(H)| ,|Z(K)|)=1$ for faithful characters $\phi \in Irr(H)$ and $\theta \in Irr(K)$ .
117131
Canonical Isomorphism Between $\mathbf{V}$ and $(\mathbf{V}^*)^*$
143051
Inverting noninvertible elements in a bigger ring.
53531
Birational and faithfully flat $\implies$ isomorphism
150572
Explicit norm on $\mathcal{C}^0(\mathbb{R},\mathbb{R})$
102495
Proof that the Casimir invariant of a representation commutes with everything
97751
Center of a group ring?
72926
Center of Direct Product is the Direct Product of Centers
22297
Normal operator $\Rightarrow$ S invariant implies $S^\perp$ invariant
88221
Find the center of the group $\operatorname{GL}(n,\mathbb R)$ of invertible $n \times n$ matrices.
32420
A complete orthonormal system contained in a dense sub-space.
37060
The Parallelogram Identity for an inner product space
156827
Prove that the directrix-focus and focus-focus definitions are equivalent
16692
a representation condition of Hilbert space
33728
Basis for Center of Group Ring
93198
The order of a conjugacy class is bounded by the index of the center
32340
Continuous bijections and their inverses