intersection of two subspaces is not $\{0\}$
6547
Given $3$-dimensional subspaces $V, W \subset \Bbb R^5$, there is a nonzero vector in $V \cap W$
63351
Intersection reports invalid geometries
21570
Intersection of a family of non-empty closed intervals
18423
Subspace of Lindelöf space is not Lindelöf: Example
115272
Showing that projections $\mathbb{R}^2 \to \mathbb{R}$ are not closed
41013
Subspace of $C^3$ that spanned by a set over C and over R
78604
How to find basis of intersection of 2 vector spaces with given basis?
76192
Intersection of volumes defined by inequalities
70413
A vector space over $R$ is not a countable union of proper subspaces
43535
show that the interval of the form $[0,a)$ or $(a, 1]$ is open set in metric subspace $[0,1]$ but not open in $\mathbb R^1$
73690
If $\mathbb R^3\setminus V$ connected where $V$ is the subspace generated by $\{(1,1,1),(0,1,1)\} $
59531
Do $T$-invariant subspaces necessarily have a $T$-invariant complement?
16654
Unions and Intersections of Open Sets are Open
38516
Show a subset is subspace of a vectorspace and find the dimension
92774
Prove that a linear subspace of $C([0,1])$ is closed
98391
example of a nonempty subset is closed under scalar multiplication but not a subspace
107056
Notation for Subspaces