devcoder
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### Questions (16)

 8 How to prove $\phi(mn) > \phi(m)\phi(n)$ if $(m,n) \ne 1$ 6 What is the quadrilateral formed by the angle bisectors of a parallelogram? 2 Find an orientation preserving isometry $f (z) = \frac{az+b}{cz+d}$ such that $f (i) = 17 + 3i$ 2 Finding a hyperbolic isometry that fixes the point $x = 2$ and $x = 17$ 2 Need help with this geometry problem on proving three points are collinear

### Reputation (251)

 +15 How to prove $\phi(mn) > \phi(m)\phi(n)$ if $(m,n) \ne 1$ +5 What is the quadrilateral formed by the angle bisectors of a parallelogram? +2 Finding an angle of a triangle in the upper half plane model given three points +5 How to prove that there is a unique geodisic segment that is pependicular to two other geodesics?

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### Tags (13)

 0 geometry × 8 0 prime-numbers × 2 0 complex-analysis × 6 0 proof-strategy 0 elementary-number-theory × 4 0 quadrilateral 0 totient-function × 3 0 roots 0 transformation × 2 0 solid-angle

### Accounts (5)

 Stack Overflow 619 rep 11021 Mathematics 251 rep 110 Database Administrators 111 rep 1 User Experience 106 rep 1 Programmers 101 rep