Derivation of Equation $8.7$ in Nielsen Chuang
122603
How does $\mathcal E(\rho)=\mathrm{Tr}_{env}[U(\rho\otimes\rho_{env})U^\dagger]$ turn into $P_0\rho P_0+P_1\rho P_1$?
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$
6899
$D_8$ as a derived subgroup
100450
Prove that 3 is a primitive root of $7^k$ for all $k \ge 1$
157031
Express $x^8-x$ as a product of irreducibles in $\Bbb Z_2[x]$
94469
How to prove that $|HK| = \dfrac{|H| \; |K|}{|H \cap K|}$?
80875
Congruence equation ...
56775
Finding minimal form -- Velleman exercise 1.5.7a
116270
Functional equations leading to sine and cosine
91684
Prove the following equation(much needed help):
41534
A system of logarithmic equations with parameters
31076
Roots of unity filter, identity involving $\sum_{k \ge 0} \binom{n}{3k}$
1794
$\exp(A+B)$ and Baker-Campbell-Hausdorff
67243
Applications for the class equation from group theory
2954
Extended Euclidean Algorithm in $GF(2^8)$?
43849
Calculating number of elements commmuting with $\sigma\in S_{10}$
57846
Multiplicative inverse in $\operatorname{GF}(2^8)$?