The union of two subspaces
11301
Union of two vector subspaces not a subspace?
33642
Finite dimensional subspace of $C([0,1])$
88728
Dimensions of vector subspaces in a direct sum are additive
53261
Show that Pn is an (n+1)-dimensional subspace
4374
Geometric interpretation of a vector space and subspace?
18572
Union of a family of connected pairwise not disjoint subspaces is connected
50159
How to prove if $\Bbb R^n=W_1\cup W_2\cup \cdots\cup $ where each $W_k$ is a subspace, then $\Bbb R^n=W_i$ holds for some $i$
95513
Proving $W$ is a subspace of $P_{2}$
86325
Is an increasing union of subspaces a subspace?
4319
Vector space can be written as direct sum of subspaces
9268
Proving that the Union of Two Compact Sets is Compact
76160
Dimension of the sum of two vector subspaces
92291
$U_1, U_2, ..., U_k$ subspaces of linear space $X$ with same dimensions, prove $X=U_1\oplus V=U_2\oplus V=...=U_k\oplus V$
26529
How to identify "naturally" two subspaces?
106756
Union and Intersection of Sets $A_{i}$ and $B_{j}$
115368
Diagonal Subspace of Cartesian Product
587
Ideal Generated by the Union of Two Ideals