False Proof of $7=8$
41418
$2+2 = 5$? error in proof
81601
Prove that if $x$ is odd then $x^2 -1$ is divisible by $8$.
125040
Show by induction : $n^7-n$ is a multiple of 7
121142
Take $G$ to be a group of order $600$. Prove that for any element a in $G$ there exist a $b$ in $G$ such that $a = b^7$
61987
$x^2+1=0$ in $\mathbb{Z}_7$
158364
Are there uncountably many $A\in M_3 (\mathbb {R})$ such that $A^8=I $?
119152
Proving irreducibility of $x^6-72$
134454
Proof that every number ≥ $8$ can be represented by a sum of fives and threes.
133017
Prove that $n^n>1\times3\times5\times7\times \dots\times(2n-1)$
134470
Prove $\frac{k^7}7+\frac{k^5}5+\frac{2k^3}3-\frac k{105}$ is a integer by mathematical induction
100450
Prove that 3 is a primitive root of $7^k$ for all $k \ge 1$
121918
Why is $5^{n+1}+2\cdot 3^n+1$ a multiple of $8$ for every natural number $n$?
158335
Why is this $0 = 1$ proof wrong?
49548
If $(a + ib)^3 = 8$, prove that $a^2 + b^2 = 4$
75387
A proof that $1=2$. May I know why it’s false?
141816
factor $z^7-1$ into linear and quadratic factors and prove that $ \cos(\pi/7) \cdot\cos(2\pi/7) \cdot\cos(3\pi/7)=1/8$
33477
Proving that if $A$ is a $8\times 8$ matrix over $\mathbb{R}$ and $A^3=A$, then $A$ is diagonalizable.