What are the differences between $\mathbb{R}^{k+m}$ and $\mathbb{R}^{k}×\mathbb{R}^{m}$
71767
What is the difference between $\Bbb{R^n}\times\Bbb{R^m}$ and $\Bbb{R^{m+n}}$?
41398
For a ring $R$, does $\operatorname{End}_R(R)\cong R^{\mathrm{op}}$?
37569
Prove that $\binom{n}{r} + \binom{n}{r+1} = \binom{n+1}{r+1} $
84189
Is $\mathbb{C}$ equal to $\mathbb{R}^2$?
39646
Is there a relation between $\rho(A) + \rho(B)$ and $\rho(A+B)$, where $\rho$ is the spectral radius?
63879
Prove that $\sum_{k=0}^r {m \choose k} {n \choose r-k} = {m+n \choose r}$
141961
What is the difference between [[ $a == z* ]] and [ $a == z* ]?
82474
Isometries of $\mathbb{R}^n$
132386
Show that $(\mathbb{Q}^*,\cdot)$ and $(\mathbb{R}^*,\cdot)$ aren't cyclic
27188
Bijection between $\mathbb{R}$ and $\mathbb{R}/\mathbb{Q}$
57037
How does $(a,b)$ where $a,b\in \mathbb{Q}$ form a basis for $\mathbb{R}$?
61375
Meaning of $\mathbb{R}[x]$
108955
Showing $(\mathbb{Q},+)$ is not isomorphic to $(\mathbb{R},+)$
155642
Understanding divison by monic polynomial in $R[x]$ where $R$ is an arbitrary ring
19260
What does the notation $q^k || n$ mean?
64179
What is the difference between the standard representants of $\mathbb Z/q\mathbb Z$?
120235
Clarification of the notation $f: \mathbb{R} \setminus\{3\} \to\mathbb{R}\setminus\{2\}$