Feb 24 |
A Three Group Split |

Feb 23 |
Probability in Dart Throwing |

Feb 23 |
Snake Permutations And Their Number |

Feb 23 |
An Inequality in Triangle form the 1996 APMO |

Feb 22 |
Kunihiko Chikaya's Inequality with a Constraint |

Feb 22 |
Expectation of the Largest Number |

Feb 21 |
Cute Exercise by Dorin Marghidanu |

Feb 21 |
Arithmetic of Pie Sharing |

Feb 21 |
Dan Sitaru's Inequality with a Double Integral |

Feb 20 |
Circle Center by Paperfolding |

Feb 20 |
Waiting for All Six Outcomes |

Feb 19 |
Golden Ratio in Circles |

Feb 19 |
Uniqueness of Number 5 |

Feb 18 |
Luca Moroni's Problem In Equilateral Triangle |

Feb 18 |
A Triangle in a Rhombus with a 60 Degrees Angle |

Feb 17 |
Acting As a Team I |

Feb 16 |
Two in a Row |

Feb 15 |
Golden Ratio in Isosceles Triangle |

Feb 15 |
A Property of Angle Bisectors |

Feb 15 |
Probability of a Random Inequality |

Feb 14 |
Probability of a Meet in an Elimination Tournament |

Feb 14 |
Golden Ratio in Two Squares, Or, Perhaps in Three |

Feb 14 |
Thanos Kalogerakis's Problem in Circle and Square |

Feb 13 |
Playing with Integers and Limits |

Feb 13 |
Golden Ratio in Equilateral Triangle on the Shoulders of George Odom |

Feb 13 |
A Modified Sangaku |

Feb 11 |
Converting Temperature From $C^{\circ}$ to $F^{\circ}$ |

Feb 11 |
A Problem in a Configuration of Three Squares |

Feb 10 |
Golden Ratio in Square |

Feb 9 |
Triangle on a Rectangular Hyperbola |

Feb 9 |
Euler Line Through a Vertex |

Feb 9 |
Ji Chen's Inequality |

Feb 9 |
Functional Inequality from Vietnam |

Feb 8 |
Matching Socks in Dark Room |

Feb 8 |
Guessing Hat Numbers |

Feb 6 |
Inequality in Convex Quadrilateral |

Feb 5 |
Solving a Peculiar Third Degree Equation |

Feb 5 |
Stars in Array |

Feb 3 |
Equal And Perpendicular Segments in a Square |

Feb 1 |
Expectation of Interval Length on Circle |

Feb 1 |
Waiting to Exceed 1 |

Feb 1 |
An Angle Inequality in Triangle with Perpendicular Medians |

Feb 1 |
The Triangle of the Medians |

Jan 30 |
Waiting for a Larger Number |

Jan 30 |
Elegance in Integers by Dorin Marghidanu |

Jan 30 |
Hadamard's Determinant Inequalities and Applications II |

Jan 30 |
A Trigonometric Inequality with Ordered Triple of Variables |

Jan 29 |
An Inequality with Two Triples of Variables II |

Jan 25 |
Two Equilateral Triangles on Sides of a Square |

Jan 25 |
Hadamard's Determinant Inequalities and Applications I |

Jan 25 |
Random Sum |

Jan 24 |
Number of Wire Loops |

Jan 24 |
Probability of Random Lines Crossing |

Jan 24 |
Shelving an Encyclopaedia |

Jan 23 |
Tony Foster's Integer Powers in Pascal's Triangle |

Jan 22 |
A Triangle Problem from Caucasus |

Jan 22 |
The Most Likely Position |

Jan 20 |
Volume Inequality in Tetrahedron |

Jan 20 |
An Isoperimetric Problem in Quadrilateral |

Jan 18 |
Dan Sitaru's Cyclic Inequality in Three Variables VIII |

Jan 17 |
The Expected Number of Fixed Points |

Jan 16 |
Choosing the Largest Random Number |

Jan 16 |
Golden Ratio in Square And Circles |

Jan 15 |
Pythagorean Theorem by Stretching |

Jan 15 |
Quadrilateral Inscribed into Parallelogram |

Jan 14 |
Dan Sitaru's Cyclic Inequality in Three Variables VII |

Jan 14 |
Probability of an Odd Number of Sixes |

Jan 14 |
To Bet Or Not To Bet |

Jan 14 |
Simple Nameless Inequality |

Jan 14 |
Dorin Marghidanu's Sums and Products |

Jan 13 |
Three Complex Numbers Satisfy Fermat's Identity For Prime Powers |

Jan 13 |
Dropping Numbers into a 3x3 Square |

Jan 12 |
Sam Walters' Four Questions |

Jan 12 |
Piecewise Carpets in Parallelogram |

Jan 11 |
Why Can't They Be All Different? |

Jan 11 |
6th European Mathematical Cup (2017), Junior Problem 4 |

Jan 8 |
Metamorphosis of a Quadratic Function |

Jan 7 |
Flat Probabilities on a Sphere |

Jan 6 |
A Welcome Problem for the Year 2018 |

Jan 6 |
A Farewell Problem for the Year 2017 |

Jan 6 |
An Inequality Involving Arithmetic And Geometric Means |

Jan 5 |
The Marriage Problem |

Jan 4 |
An Extension of a Sangaku with Touching Circles |

Jan 4 |
The Coffee Shop Game |

Jan 2 |
An Inequality with Two Triples of Variables |

Jan 1 |
Flat Probabilities on a Sphere |