Isometries in $\Bbb R^2$ are linear
71975
Showing that an Isometry on the Euclidean Plane fixing the origin is Linear
85713
Showing Parallelism is an equivalence relation in $\Bbb R ^2$
64025
Ring homomorphisms from $\Bbb Q$ into a ring
125212
How to Show that the Only Subspaces of $R^2$ are the zero subspace, $R^2$ itself, and the lines through the origin
57166
Showing that $\Bbb R[x] / \langle x^2 + 1 \rangle$ is isomorphic to $\Bbb C$ question
12698
Orthonormal basis for $\mathcal{L}^2([0,1])$
145462
On the canonical isomorphism between $V$ and $V^{**}$
50731
Isometries of the sphere $\mathbb{S}^{n}$
137093
What is the codimension of matrices of rank $r$ as a manifold?
89649
Linear Algebra munkres analysis on manifolds question.
90525
The subspace of $\ell_2$
6171
Isomorphism between $\Bbb{Z}[\sqrt{d}]$ and a quotient of $\Bbb{Z}[X].$
48419
Difference between $\mathbb{R}$-linear and $\mathbb{C}$-linear maps
141794
Invariant subspaces of specific dimension
27517
Isometry in compact metric spaces
63538
Impossibility of constructing a continuum-size linearly independent set in $\Bbb R$
91222
Isomorphism between $\mathfrak o(4,\mathbb R)$ and $\mathfrak o (3,\mathbb R) \oplus\mathfrak o (3,\mathbb R) $