If $(r) = (s)$, then does $r = s?$
16023
Are associates unit multiples in a commutative ring with $1$?
153355
Given $S \in B(Y^{*}, X^{*})$, does there exist $T\in B(X,Y)$ such that $S=T^{*}$?
143200
$f(r,\theta)=(r\cos\theta,r\sin\theta)$ Then
45606
Is there a bijection from [0,1] to R?
90071
Why don't we have an isomorphism between $R[x]$ and $ R[[x]]$?
65224
Prove that if $a^2 = a$ for all elements of the ring $R$, then $R$ has characteristic 2. Is the converse of the statement true?
122958
$R/I$ is commutative iff $rs-sr \in I$
10444
If $\{x,\{x,y\}\} = \{z, \{z,t\}\}$, then must it be $x = z$ and $y = t$?
6166
Is the following statement provable?
16550
Is $ d(X) \le s(X)? $
86030
Prove or disprove - If a divides b and b divides a does a=b
157840
Is it true that $(R\times S)[G]\cong R[G]\times S[G]$?
48525
Does $r$-squared have a $p$-value?
73927
Is $\mathbb{R}$ a subset of $\mathbb{R}^2$?
46106
Prove that $D_r \circ D_s = \{ (x,y) \in \mathbb{R}^2 \ | \ |x-y|<r+s \}$, where $D_a = \{ (x,y) \in \mathbb{R}^2\ | \ |x-y| < a \}$
49409
Are all of the following statements equivalent? (vectors and matrices)
32180
Why is "$A$ unless $B$" equivalent to $A \lor B$?