Set of Hermitian matrices is closed
51914
Show that $S$ is compact.
8557
Invertible Matrices are dense
78399
In $T_1$ space, all singleton sets are closed?
42494
The boundary is a closed set
98391
example of a nonempty subset is closed under scalar multiplication but not a subspace
143586
Is $[0,1]$ a union of family of disjoint closed intervals?
136851
Proof that the set of subsequential limits is closed
69893
An inner product space and its proper closed subspace with trivial orthogonal complement
74764
Dimension for a closed subspace of $C[0,1]$.
116908
Basis for set of nxn matrices with trace = 0
30877
How to show that the set of orthogonal n x n matrices forms a group under multiplication
31186
Hermitian matrix such that $4M^5+2M^3+M=7I_n$
74792
$(X,\tau)$ needs to be $T_1$ in order to guarantee that $A'$ is closed?
94844
Unitary map between sets of vectors
107975
Show that the class of regular languages is closed under shuffle
2109
Max dimension of a subspace of singular $n\times n$ matrices
75104
Existence of some type matrix