Is there any different between $\mathbb{C}[x]$ and $\mathbb{C}[[x]]$
66020
What is $\mathbb Z[[t]]$? What are the double brackets?
62770
Does $a\mid bc$ imply $a\mid b$ or $a\mid c$?
108955
Showing $(\mathbb{Q},+)$ is not isomorphic to $(\mathbb{R},+)$
53335
Why isn't $\mathbb{C}[x,y,z]/(xz-y)$ a flat $\mathbb{C}[x,y]$-module
142470
$\mathbb{Q}(\sqrt{p},\sqrt[3]{q})= \mathbb{Q}(\sqrt{p}\cdot \sqrt[3]{q})$ ??
62755
The simplest way of proving that $|\mathcal{P}(\mathbb{N})| = |\mathbb{R}| = c$
158502
Showing $\sin(\bar{z})$ is not analytic at any point of $\mathbb{C}$
90071
Why don't we have an isomorphism between $R[x]$ and $ R[[x]]$?
11809
Is there any isomorphism between the non-zero complex numbers under multiplication and the complex numbers under addition?
116168
Is $e^x$ the only isomorphism between the groups $(\mathbb{R},+)$ and $(\mathbb{R}_{> 0},*)$?
79367
Understanding the difference between two theorems related to $|G\,:\,K|=|H\,:\,K|\cdot|G\,:\,H|$.
110944
Proving that $AB-BA=cI$ for nontrivial $c \in \mathbb{C}$
85770
What is the difference between ∀x(p(x) →q(x)) and ∀x(p(x) ∧q(x))?
5250
Are $T\mathbb{S}^2$ and $\mathbb{S}^2 \times \mathbb{R}^2$ different?
127198
What is $\mathbb{C}^{Aut(\mathbb{C}/\mathbb{Q})}$?
98587
$\mathbb Z [X] / (X)$ isomorphic to $\mathbb Z[X] / (X+1)$ isomorphic to $\mathbb Z [X] / (X+2015)$
53331
$\mathbb{Q}(\sqrt2, \sqrt3)$ is not isomorphic to $\mathbb{Q}(\sqrt[4]2)$