## Must see

Some really good posts, which I consider more interesting will be presented below. I hope you’ll find them interesting.

Generalized Poincare Inequality

Existence Result for the Isoperimetric Problems

Miklos Schweitzer 2011 Problems

Shape Optimization Course – Day 2

Shape Optimization Course – Day 1

Modica-Mortola Theorem

Uniqueness and Error estimates via Kinetic Entropy Defect Measure

Miklos Schweitzer 2011 Problems

Separable Spaces

Catenary

Orthogonal matrices form a manifold

Martingales

Existence of a triangle with prescribed angle bisector lengths

Geometric Transformation Solutions

Cauchy problem with two solution has an infinity of solutions

Cool Coloring of

Harmonic functions in the plane vanishing on some halflines

Matrix power of any order must be identity

Shortest path on a sphere

Proof of Van der Waerden’s Theorem

A non-polynomial continuous function on a compact is a uniform limit of polynomials, whose degrees must converge to

Infinite cardinal numbers operations. See also the Article page for pdf versions.

Isoperimetric inequality

Proof of Euler polyhedral formula

Bertrand’s Postulate

Interesting characterization of a polynomial

Sierpinski’s Theorem