Prove that orbits are conic sections
1957
Derivation of Kepler's laws
56320
Prove that the circumradius of $\triangle PAB$ is constant
141101
Russia (2000) contest:Prove the existence of a pair of rows and columns with intersections differently coloured
148169
prove that line bisect section
24128
How do i show that $w=z^2$ maps $|z-1|\leq 1$ onto $R=2(1+\cos \theta)$?
37635
Diffeomorphism group of the unit circle
100085
Spivaks Calculus. Conics Section. Change of coordinates system
46309
Prove that this graph is nonplanar
115677
Prove the equality of circle's areas
157477
Area of a quadrilateral proof
110472
Existence of a Pivot Point in Euclidean Geometry
22869
Prove $[0, 1]$ and $(0, 1]$ are equinumerous by use of bijection
101493
Prove that one diagonal of a quadrilateral bisects the other
113915
A star shaped open set in $\mathbb{R}^n$ is diffeomorphic to $\mathbb{R}^n$
76586
How to prove that linear transformations transforms lines into lines
55493
Showing that the path-connected component of the identity matrix in a subgroup of $GL_n(\Bbb R)$ is a normal subgroup
8456
Prove that $SL(2,\mathbb{R})$ acts transitively on the upper half plane