Prove $a=(12345)$ and $b=(21345 )$ are NOT conjugate in $A_5$
131885
Show that not all 5 cycles in $A_5$ are conjugate in $A_5$
32929
Questions about proving $\lnot \lnot a = a$
37219
Quadratic Integers in $\mathbb Q[\sqrt{-5}]$
51706
If $(k,l) = 1$, show that $(b_2k-b_1l, a_1l-a_2k) = 1$ for $a_1b_2-a_2b_1=1$
116737
An element of a group $G$ is not conjugate to its inverse if $\lvert G\rvert$ is odd
76032
Prove that if m is a square integer then m is neither congruent to 2 modulo 5 nor congruent to 3 modulo 5
3439
Other proofs that subgroups of $A_5$ have order at most 12
131306
Prove that a group of order $2^5 \cdot 7^5$ is not simple
136367
Prove $ ∀a, b, c ∈ Z,$ if $ab + ac ≡ 3$ (mod 6) then b $\not\equiv$ c (mod 6).
130381
bijection from $(a,b)$ to $\Bbb R$
140446
Prove that $A \smallsetminus (A \smallsetminus B) = A \cap B$
82046
prove that this double transpose $T''$ it's not injective.
140167
Proving $A+A'B=A+B$ without truth tables
128060
Proof that the relation $5 \mid (a + 4b)$ is symmetric and transitive
22856
Ways to go from A to B(proof)
137808
$n^2 + 3n +5$ is not divisible by $121$
90566
There exists surjections from A onto B and vice versa, and there is no bijection between the sets?