December
December 28th and 29th Solutions for puzzles A Heavy Chest and A Farmer and a Goat-2 are available.
December 25th Problems of the current Sharygin Geometry Olympiad qualification round. Any high-school student may participate per correspondence. Solutions must be delivered not later than on April 1, 2016.
December 24th A new puzzle Two Families-1 in the collection River Crossing Puzzles.
December 22nd Problems and solutions for years 2011 from Sharygin Geometry Olympiad.
December 21st To the collection of River Crossing Puzzles was added the solution for the puzzle A Farmer and a Dog-2.
December 17th To the collection of River Crossing Puzzles was added the puzzle Thieves with Suitcases.
December 15th Problems and solutions for years 2012 from Sharygin Geometry Olympiad.
December 14th To the collection of River Crossing Puzzles was added the solution for the puzzle Merchants versus Robbers-2.
December 11th To the collection of River Crossing Puzzles was added the solution for the puzzle Old Grandees-1.
December 10th To the collection of River Crossing Puzzles was added the puzzle Policemen and Refugees.
December 6th and 7th To the collection of River Crossing Puzzles were added solutions for puzzles Thieves and a Robber and Torch on a Bridge-1.
December 3d. To the collection of River Crossing Puzzles was added the puzzle Heavy Chest.
December 1st 2015. A bit more information about Sharygin Geometry Olympiad and problems for the year 2013.
November
November 30th To the collection of River Crossing Puzzles was added the solution for the puzzle Knights and Pages-1.
November 28th Information about Sharygin Geometry Olympiad and problems for years 2014 and 2015.
November 26th To the collection of River Crossing Puzzles was added the solution for the puzzle Run Away-1.
November 24th In All-Round math competition were added problems for years 2012.
November 23d To the collection of River Crossing Puzzles was added the solution for the puzzle Missioneries and Cannibals.
November 21st Information about All-Round math competition and problems for years 2013 and 2014.
November 18th To the collection of River Crossing Puzzles was added the solution for the puzzle Gold in Suitcases.
November 17th To the collection of River Crossing Puzzles was added the solution for the puzzle Adults and Children.
November 16th To the collection of River Crossing Puzzles was added the solution for the puzzle Weight Limit.
November 14th To the collection of River Crossing Puzzles were added the solution for the puzzle Same Time and a level 1 version of the puzzle Knights and Pages.
November 13th To the collection of River Crossing Puzzles was added the solution for the puzzle Jealous Husbands-1. The puzzles are divided into 5 levels.
November 12th To the collection of River Crossing Puzzles was added the solution for the puzzle A Farmer and a Dog-1. The puzzles are divided into easy, medium and hard ones.
November 10th A new design for the English homepage. I hope it'll help you to find what you are interested in. .
November 8th Yesterday I worked as a coordinator for algebraic problems on the Baltic Way competition. Here are the problems.
November 3d To the collection of River Crossing Puzzles was added a solution for the puzzle A Farmer and a Goat-1. The puzzles are divided into easy, medium and hard ones.
November 2nd To the collection of River Crossing Puzzles was added a solution for the puzzle A Round Table.
November 1st 2015 To the page River Crossing Puzzles was added one more puzzle group A Farmer and a Dog.
October
October 31th To the page River Crossing Puzzles was added one more puzzle Gold in Suitcases.
October 29th To the page River Crossing Puzzles are added 3 puzzles.
October 27th Now on the page River Crossing Puzzles are more than a dozen puzzles.
October 26th To the page River Crossing Puzzles are added 3 puzzles.
October 24th A collection of River Crossing Puzzles.
October 20th A new version of my CV.
October 17th This year the mathematical contest Baltic Way takes place in Stockholm 5-9 November. My daughter Valentina and me will be coordinators.
August
August 23d Three problems from the year 2001 are added to My problems from the Tournament of Towns .
August 17th, 18th and 21st Twelve problems from the year 2000 are added to My problems from the Tournament of Towns .
August 13th and 15th To My problems from the Tournament of Towns are added 13 more problems.
August 11th, 2015 My book “Mathematical Constructions: from Huts to Palaces” (in Russian) is published, see here.
June
June 15th To the page NYUAD15 is added Inequalities: Stepwise Improvement.
June 14th To the page NYUAD15 is added Functional and Differential Inequalities.
June 13th To the page NYUAD15 is added Dimension and Matrices.
June 12th To the page NYUAD15 are added Vector spaces. Dimension and Continuous Functional Equations.
June 11th The second session started today. To the page NYUAD15 are added Vectors. Dot product and Functional Equations.
June 6th To the page NYUAD15 is added Test2 (4 problems).
June 4th and 5th To My problems from the Tournament of Towns are added 10 more problems.
June 1st, 2015 To Lessons is added 10 Problems for Beginners
May
May 30th My 1st lecture course in Abu Dhabi is finished. To the page NYUAD15 are added the list of problems Go-between in Inequalities.
May 29th To the page NYUAD15 are added the list of problems Infinite Algorithms.
May 28th To the page NYUAD15 are added the list of problems Finite Fields.
May 27th To the page NYUAD15 are added 2 lists of problems: Remainders and Modular Arithmetic and Diophantine Equations.
May 26th To the page NYUAD15 are added 2 lists of problems: Right or Wrong: Prime Factorization and Polynomials with Integer Coefficients.
May 25th Lectures in Abu Dhabi started. To the page NYUAD15 are added 2 lists of problems: Examples in Calculus and Inequalities and Derivatives.
May 22th and 23d . Added 10 problems to My problems from the Tournament of Towns.
May 21th To the page NYUAD15 is added the list to the lecture Sequences
May 19th Started a page My problems from the Tournament of Towns.
May 14th To the page NYUAD15 is added the list with 10 Sums to find
May 11th To the page NYUAD15 is added a paper with some answers and solutions of Quadratic Polynomials.
May 9th After the lesson to the page NYUAD15 is added a paper with some answers and solutions of Polynomials and Equations.
May 8th To the page NYUAD15 is added a list with theorems and problems Polynomials and Equations for the lesson tomorrow.
May 7th To My problems is added the link to the article Occupation games on graphs in which the second player takes almost all vertices related to the problem about 11 programmers geniuses.
May 5th To the page NYUAD15 is added a list with a dozen problems Quadratic polynomials
May 4th To My problems is added the problem about 11 programmers geniuses.
May 2nd A new page is opened with lessons in New York University in Abu Dhabi.
May 1st, 2015 To Lessons is added Example+Border
April
April 30th To My problems is added the link to the article “The line of sages” by T.Khovanova.
April 27th and 28th To Lessons is added Test1 (doc and pdf) and Homework problems.