The inequality (condition) of Hadwiger.

September 13th, 2016

The Hadwiger’s condition determines the possibility to transporter a convex figure F1 in the interior of a convex figure  F0. A new proof.

The vector relative to simplex

April 10th, 2016

A new glance to John’s Matrix

Το πρόβλημα των Fermat-Toricely

April 1st, 2016

Θεωρούμε ένα σύνολο σημείων G. Πότε το άθροισμα των αποστάσεων σημείου Μ δοθείσης επιφάνειας Ε από τα σημεία  του  σημεισονόλου G γίνεται Ελάχιστο ??

A problem of Geometry

March 28th, 2016

Cauchy-Schwarz Inequality in Geometry

Six points Property

March 12th, 2016

Another proof about the problem of P.Erdos

The perimeters of the cevian and pedal triangle

February 3rd, 2016

The perimeter of the Cevian triangle of a point M in a triangle ABC, is no smaller of the perimeter of the pedal triangle of the point M.

Flowers in the stone

January 30th, 2016


The Davenport-Helly’s Theorem

January 30th, 2016

A1,A2,A3,A4,A5 five points in three space. For every point O, one at least angle from AiOAj is non obtuse.


January 25th, 2016



January 25th, 2016