Dane

 31 Examples of patterns that eventually fail 28 Proof of a formula involving Euler's totient function: $\varphi (mn) = \varphi (m) \varphi (n) \cdot \frac{d}{\varphi (d)}$ 19 Why is it called commutative property? 15 Every Transitive Permutation Group Has a Fixed Point Free Element 12 Is $\sqrt{2}\in\mathbb{Q}(\sqrt[8]{3})$ or not?

### Reputation (3,332)

 +65 Riemann-Roch to find the distance and the rate of Goppa code +18 Residue of $\sum^{22}_{i=1} i!$ divided by $23$ +10 Proof of a formula involving Euler's totient function: $\varphi (mn) = \varphi (m) \varphi (n) \cdot \frac{d}{\varphi (d)}$ +5 Are fields flat $\mathbb Z$-modules?

### Questions (21)

 11 Proving formula involving Euler's totient function 10 Polar Density of a Set of Primes 9 notation for ramification index and inertial degree 8 Learning to use MAGMA 8 Are fields flat $\mathbb Z$-modules?

### Tags (80)

 79 abstract-algebra × 28 23 field-theory × 7 62 group-theory × 21 21 calculus × 4 38 elementary-number-theory × 6 21 definition × 2 36 totient-function × 3 19 math-history × 2 28 finite-groups × 7 19 terminology

### Accounts (13)

 Mathematics 3,332 rep 1836 Area 51 151 rep TeX - LaTeX 127 rep 5 MathOverflow 113 rep 14 Stack Overflow 101 rep 3