Why the community of two subspace is not necessarily a whole space of the set R?
4717
The union of linear subspaces is not necessarily a subspace
45111
Number of Subspaces that contains other Space
7069
On the product of $\mathfrak c$-many separable spaces
41047
Subspace Topology of a subset
53132
A convex subset of a set has 'smaller' boundary than the set?
28819
A union of two subspaces not equal to the vector space.
93263
Can contractible subspace be ignored/collapsed when computing $\pi_n$ or $H_n$?
131890
Totally disconnected space that is not $T_2$
80202
Why is $[0, 1] \cap \mathbb{Q}$ not compact in $\mathbb{Q}$?
88728
Dimensions of vector subspaces in a direct sum are additive
35625
Direct sum of orthogonal subspaces
41347
The dimension of the intersection of two vector subspaces
78082
Dense subset of two Banach spaces also dense in the intersection
63697
connected subspaces need to lie in one separated component
14429
dimension of a subspace spanned by two subspaces
144731
Disjoint closed sets in a second countable zero-dimensional space can be separated by a clopen set
98391
example of a nonempty subset is closed under scalar multiplication but not a subspace