Chronology of Updates

Note

I have placed chronology of updates for 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 and 2016 into separate files. Starting with 1997, the most recent entries appear topmost. Besides providing an insight into this site's evolution, chronology of updates may be used for word searches.

Nov 19 Problem 4186 from Crux Mathematicorum
Nov 18 Probability of Four Random Integers Having a Common Factor
Nov 17 An Inequality between AM, QM and GM
Nov 17 An inequality in 2+2 variables from SSMA magazine
Nov 16 Dorin Marghidanu's Cyclic Inequality in Three Variables III
Nov 16 Exploring Vecten's Wreaths with Linear Algebra
Nov 16 Equilateral triangle and squares
Nov 15 Two Problems by Kunihiko Chikaya
Nov 14 Three Random Points on a Circle
Nov 14 Semicircle Coverage
Nov 14 Hemisphere Coverage
Nov 12 Samuel G. Walters' Congruence
Nov 10 Problem 4117 from Crux Mathematicorum
Nov 10 Without Definitions: Why $\displaystyle\frac{1}{3}+\frac{2}{5}=\frac{11}{15}?$
Nov 10 A Followup on Lewis Carroll's Pillow Problem
Nov 9 Practical Inevitability of Empty Spaces
Nov 8 Practical Inevitability of Clustering
Nov 7 Impossiblity Condition in Concurrent Cevians
Nov 1 A Cyclic Inequality in Three Variables by Uche E. Okeke
Oct 31 A Problem in Division of Polynomials
Oct 30 A Property of Product of Special Matrices, Probably Folklore
Oct 30 Collinearity in Tangent Circles
Oct 30 Tying Knots In Brazil
Oct 30 Trigonometric Inequality with Integrals
Oct 28 Coin Tossing Contest
Oct 28 Probability of $2^n$ Beginning with Digit $1$
Oct 27 Recollecting Forgotten Digit
Oct 27 Three Variables, Three Constraints, Two Inequalities (Only One to Prove) - by Leo Giugiuc
Oct 27 A Cyclic Inequality from Math Phenomenon
Oct 26 Numbers in a Square
Oct 26 Numbered Balls Out Of a Box
Oct 26 Balls of Two Colors II
Oct 25 Odds and Chances in Horse Race Betting
Oct 24 A Cyclic Inequality from the 6th IMO, 1964
Oct 24 An Inequality of Degree 3 with Inradius
Oct 23 Waiting for an Ace
Oct 23 A Long Cyclic Inequality of Degree 4
Oct 22 Chess tournament with 1.5 Points Winners
Oct 20 A Not Quite Cyclic Inequality from Tibet
Oct 20 Probability a la Tristram Shandy
Oct 20 Dan Sitaru's Cyclic Inequality in Four Variables
Oct 18 Leo Giugiuc's Cyclic Quickie in Four Variables
Oct 18 Problem 11984 From the American Mathematical Monthly
Oct 17 A Cyclic Inequality with Powers 2 through 7
Oct 16 A pizza with a hole
Oct 16 A Cyclic Inequality With Constraint in Two Triples of Variables
Oct 16 Probability of Visiting Grandparents
Oct 15 Simulating Probabilities
Oct 14 An Inequality with Integrals
Oct 14 Average Visibility of Moviegoers
Oct 13 Probability of a Cube Ending with 11
Oct 13 An Inequality in Triangle with a Constraint
Oct 13 A Limit of a Series of Determinants
Oct 12 An Unusual Problem by Leo Giugiuc
Oct 12 Determinants in $\mathbb{Z}_2$
Oct 11 Problem 6 from Dan Sitaru's Algebraic Phenomenon
Oct 11 Loaded Dice
Oct 10 Six Numbers, Three Inequalities
Oct 9 Six Numbers, Two Inequalities
Oct 9 Six Numbers, One Inequality
Oct 9 Problem 1 from the Ninth Nordic Mathematical Contest (1994)
Oct 8 An Identity in Cyclic Quadrilateral
Oct 7 Dan Sitaru's Sum of a Series
Oct 6 Emil Stoyanov's From Reflections to Altitudes
Oct 2 An Inequality with Constraint in Four Variables VI
Oct 1 Dorin Marghidanu's Two-Sided Inequality
Sep 29 3-4-5, Golden Ratio
Sep 29 Kunihiko Chikaya's Inequality
Sep 27 Long Huynh Huu's Inequality and Solution
Sep 27 A Simplified Version of Leo Giugiuc's Inequality from the AMM
Sep 27 An Inequality with Exponents
Sep 26 Determinants in Pascal's Triangle
Sep 25 Dan Sitaru's Cyclic Inequality with a Constraint and Cube Roots II
Sep 24 Dorin Marghidanu's Inequality in Many Variables Plus Two More
Sep 24 Carpets in Right Triangle
Sep 23 Cyclic Inequality with Arctangents
Sep 23 Square, 45 Degrees Angle and Pythagoras' Look-alike
Sep 22 An Inequality with the Most Important Cevians
Sep 21 Dan Sitaru's Cyclic Inequality with a Constraint and Cube Roots
Sep 20 Dan Sitaru's Cyclic Inequality in Three Variables VI
Sep 20 Further Arithmetic Progression in 30-60-90 Triangle
Sep 20 Dorin Marghidanu's Inequality with Radicals
Sep 19 An Equation in RxR from Romania
Sep 19 The Contest Corner Problem 210 from Crux
Sep 18 An Inequality with Determinants VII
Sep 17 Marian Dinca's Inequality
Sep 16 Hung Viet's Inequality IV
Sep 16 Parallels through the Vertices of Equilateral Triangle
Sep 14 Dorin Marghidanu's Inequality in Many Variables
Sep 13 A Cyclic Inequality in Three Variables XXV
Sep 13 Dan Sitaru's Cyclic Inequality in Three Variables IV
Sep 11 Problem 4165 from Crux Mathematicorum
Sep 8 Problem #6 from the Italian MO 2000
Sep 4 An Inequality with Constraint XX
Sep 3 An Inequality with Constraint XIX
Sep 1 An Inequality with Constraint XVIII
Sep 1 An Inequality with Two Sets of Cevians
Aug 31 All Trigonometric Inequality in Triangle
Aug 29 Problem 4002 from Crux Mathematicorum
Aug 28 Two Solution: One Correct, One Illuminating. An Example
Aug 26 An Inequality in Triangle with Side Lengths and Circumradius
Aug 26 Problem CC156 From Crux Mathematicorum
Aug 21 A Problem in Pentagon with Supplementary Angles
Aug 19 Problem 4132 from Crux Mathematicorum
Aug 19 A Problem That Fermat Might Have Liked
Aug 19 A Problem in Pentagon with Right Angles
Aug 17 Stan Fulger's Observation in Right Triangle
Aug 16 Surprising Length Dependence In Equilateral Triangle by Miguel Ochoa Sanchez
Aug 15 Problem 4033 from Crux Mathematicorum
Aug 15 An Inequality with Just Two Variable And an Integer
Aug 10 Asymmetric Propeller, the XXI Century
Aug 9 Dan Sitaru's Exercise with Pi and Ln
Aug 9 A Refinement of Turkevich's Inequality
Aug 8 Cyclic Inequality in Three Variables by Marian Cucoanes
Aug 8 Playing on Flanks
Aug 8 Leo Giugiuc's Inequality in Triangle, Solely with Cotangents
Aug 7 An Inequality in Triangle, with Sides and Medians III
Aug 7 An Integral from the RMM
Aug 6 Mickey Might Be a Red Herring in the Mickey Mouse Theorem
Aug 5 An Inequality with Two Pairs of Triplets
Aug 4 Simple Yet Uncommon Inequalities with Absolute Value
Aug 4 A Problem From the Romanian Mathematical Competitions (2016)
Aug 4 Seyran Ibrahimov's Inequality
Aug 2 An Inequality with Sides, Cosines, and Semiperimeter
Aug 2 The Very First Functional Equation at IMO
Aug 2 An Inequality from the 1967 IMO Shortlist
Aug 1 Adil Abdulayev's Inequality With Angles, Medians, Inradius and Circumradius
Aug 1 Leuenberger's Inequality for Medians, Inradius and Circumradius
Aug 1 A Problem from the 1967 IMO Shortlist
Jul 31 Inequality 101 from the Cyclic Inequalities Marathon
Jul 31 Moments in a Peculiar Cyclic Polygon
Jul 28 Problem 2 from the 2017 IMO
Jul 28 An Inequality with Exradii and an Altitude
Jul 27 A Problem from the 1985 Balkan Mathematical Olympiad (Shortlist)
Jul 26 Van Khea's Quickie
Jul 26 One More Property of Equilateral Triangles
Jul 26 The Lepidoptera of the Triangle
Jul 25 60o Angle And Importance of Being The Other End of a Diameter
Jul 24 Michael Rozenberg's Inequality in Three Variables with Constraints
Jul 23 Problem 11867 from the American Mathematical Monthly
Jul 22 An Inequality with Inradius and Side Lengths
Jul 20 Geometric/Trigonometric Observation/Exercise
Jul 20 An Inequality in Two Or More Variables II
Jul 20 Problem From the 2016 IMO Shortlist
Jul 19 Trigonometry by Watching
Jul 18 Golden Ratio In Three Circles And Common Secant
Jul 18 Refinement on Dan Sitaru's Cyclic Inequality In Three Variables
Jul 17 Sladjan Stankovik's Inequality In Four Variables
Jul 16 Small Triangle from Small Triangle
Jul 15 Dan Sitaru's Cyclic Inequality In Three Variables with Constraints IV
Jul 13 Leo Giugiuc's Inequality with Constraint
Jul 13 Dan Sitaru's Cyclic Inequality in Three Variables III
Jul 12 An Inequality with Inradius and Excenters
Jul 12 An Inequality with Arbitrary Roots
Jul 11 Cyclic Quadrilateral, Angle Bisector And Isosceles Triangle
Jul 11 Dorin Marghidanu's Inequality in Complex Plane
Jul 11 Leo Giugiuc's Optimization with Constraint
Jul 11 An Inequality with Sines But Not in a Triangle
Jul 10 Dan Sitaru's Cyclic Inequality in Three Variables II
Jul 8 Dan Sitaru's Inequality: From Three Variables to Many in Two Ways
Jul 7 A Not Quite Cyclic Inequality
Jul 6 An Inequality in Integers III
Jul 5 An Inequality in Two Or More Variables
Jul 4 Dan Sitaru's Cyclic Inequality In Three Variables
Jul 4 An Inequality with Complex Numbers of Unit Length II
Jul 3 An Unsolvable Riccati Equation
Jul 2 Dan Sitaru's Inequality with Three Related Integrals and Derivatives
Jul 1 An Inequality from a Vietnamese Problem Book
Jul 1 Wonderful Trigonometry In Equilateral Triangle
Jun 30 Dorin Marghidanu's Inequality with Generalization
Jun 29 Same Integral, Three Intervals
Jun 28 An Inequality with Cotangents And the Circumradius
Jun 27 $x_n=\sin 1+\sin 3+\sin 5+\cdots+\sin (2n-1)$
Jun 26 Another Property of Number 4
Jun 25 An Inequality with Constraint in Four Variables V
Jun 24 Four Integrals in One Inequality
Jun 24 Dorin Marghidanu's Light Elegance in Four Variables
Jun 23 A Cyclic Inequality in Three or More Variables
Jun 22 A Limit with Fractions, Roots, Powers and Series
Jun 22 Probability of Degenerate Random Matrix in Z(2)
Jun 20 An Inequality with Angles and Integers
Jun 20 An Inequality with Cyclic Sums on Both Sides III
Jun 19 Dan Sitaru's Cyclic Inequality In Three Variables with Constraints III
Jun 19 Dorin Marghidanu's Spanish Problem
Jun 19 The 2016 ARML Competition, Problem 7
Jun 18 An Identity in Triangle with a 135 Degrees Angle
Jun 17 A Cyclic Inequality in Three Variables XXV
Jun 17 Nagel Point and Centroid on Adjacent Isosceles Triangles
Jun 15 Nagel Point on the Incircle in Isosceles Triangle
Jun 15 Centroid on the Incircle in Isosceles Triangle
Jun 15 The Range of r/R in Triangle with Centroid on the Incircle
Jun 14 Centroid on the Incircle in Right Triangle
Jun 13 An Inequality with Powers And Logarithm
Jun 13 Distances to Three Points on a Circle
Jun 12 An Equation in Factorials
Jun 12 Problem 4 from the 2016 OBJM TST
Jun 12 An Inequality Solved by Changing Appearances
Jun 8 Michael Rozenberg's Inequality in Two Variables
Jun 7 An Inequality for Cevians And The Ratio of Circumradius and Inradius
Jun 7 A Problem with a Magical Solution from Secrets in Inequalities
Jun 6 Gheorghe Stoica's Problem from Gazeta Matematica
Jun 6 The Midpoint of an Angle Bisector - a Problem by A. A. Zaslavsky
Jun 5 Parallel Lines in Rhombus
Jun 5 A Cyclic Inequality of Degree Four
Jun 5 Two Circles, Two Segments - One Ratio
Jun 4 An Inequality in Fractions with Absolute Values
Jun 4 R and r When G on Incircle
Jun 3 Problem 4 from the 4th BJMO Team Selection Test
Jun 3 Two Regular Pentagons Joined at Vertex
Jun 2 Another Inequality with Logarithms, But Not Really
Jun 1 Segment Trisection II
May 31 An Inequality with Cyclic Sums on Both Sides II
May 31 Leo Giuguic's Exercise
May 30 A Problem of Two Incircles by Miguel Ochoa Sanchez
May 29 Refinement of Padoa's Inequality
May 28 Two Butterfly Theorems by Sidney Kung
May 28 A Cyclic Inequality in Triangle for Integer Powers
May 27 J. Arioni's Proof of Morley's Theorem
May 27 Mixing Incenter And Orthocenter in Greece
May 27 Dan Sitaru's Amazing, Never Ending Inequality
May 26 Dorin Marghidanu's Tribute to Descartes
May 26 An Inequality for Sides and Area
May 25 A Problem from Greece via Peru
May 25 Dan Sitaru's Cyclic Inequality In Three Variables with Constraints II
May 24 An Inequality with Angle Trisectors
May 23 A System of Two Equations Replete with Squares
May 23 An Inequality of the Areas of Triangles Formed by Circumcenter And Orthocenter
May 22 An Old Inequality
May 22 A Cyclic Inequality in Three Variables with a Variable Hierarchy
May 22 Minimum of a Cyclic Sum with Logarithms
May 21 Inequalities with Double And Triple Integrals
May 21 Why The Number of Primes Could Not Be Finite?
May 20 An Inequality with Cyclic Sums on Both Sides
May 20 Golden Ratio in Wu Xing
May 19 Optimization with Many Variables
May 19 A Problem from the Danubius-XI Contest
May 18 An Inequality in Four Weighted Variables
May 18 An Inequality in Three (Or Is It Two) Variables
May 18 Equilateral Triangle in Square And the Pedal Circle of Its Apex
May 18 Equilateral Triangle in Square with the Cevians through Its Apex
May 17 A Simple Solution to a Difficult Sangaku Problem
May 17 Dan Sitaru's Integral Inequality with Powers of a Function
May 17 Equilateral Triangle in Square and Its Circumcircle
May 5 Dan Sitaru's Inequality by Induction
May 5 Golden Ratio in Three Regular Pentagons II
May 4 An Inequality with Constraint in Four Variables IV
May 4 An Inequality with Two Cyclic Sums
May 3 Dorin Marghidanu's Inequality with Constraint
May 3 Golden Ratio in Three Regular Pentagons
May 3 From Perpendicular Center Lines to Concyclic Points
May 3 An Inequality with Sides, Altitudes, Angle Bisectors and Medians
May 2 Construction: Parallel Line through Point
May 1 More of More of Gloden Ratio in Equilateral Triangles
Apr 30 Cubes Constrained
Apr 30 An Inequality with Tangents and Sides
Apr 30 From Six Variables to Four - It's All the Same
Apr 29 An Inequality With Six Variables and Constraints
Apr 29 Excircles in Trapezoid
Apr 28 A Partly Cyclic Inequality in Four Variables
Apr 28 (tan(72)$\pm$tan( 60)sin(30$\mp$18)= 1
Apr 28 Functions And Triangles
Apr 27 Three Travelers in Uniform Motion
Apr 26 Geometric Proof of Hlawka's Inequality
Apr 26 A Simple Cyclic Inequality in Three Variables
Apr 25 An Inequality with One Tangent and Six Sines
Apr 24 Concurrence in Right Triangle
Apr 23 Simple Inequality with a Variety of Solutions
Apr 22 Hlawka-like Inequality for Convex Functions
Apr 21 A Cyclic Inequality in Three Variables XXIV
Apr 21 Bottema's Point Sibling
Apr 20 Twin Inequalities in Four Variables: Twin 1
Apr 20 Twin Inequalities in Four Variables: Twin 2
Apr 19 Dorin Marghidanu's Inequality in Integer Variables
Apr 19 K. Knop's Problem with Two Regular Pentagons And an Equilateral Triangle
Apr 18 Similar Parallelograms on Sides of a Triangle
Apr 18 Unsolved Problem from Crux Solved
Apr 16 An Inequality with Integrals and Radicals
Apr 16 An inequality with Three Points
Apr 14 An inequality with Cosines and a Sine
Apr 14 Problem 3 from the EGMO2017
Apr 13 A Cyclic Inequality in Three Variables XXIII
Apr 13 An Inequality with Circumradii And Distances to the Vertices
Apr 12 A simple integral, III
Apr 12 Problem 1 from the EGMO2017
Apr 11 An Inequality with Just Two Variable VIII
Apr 11 Cyclic Inequality with Square Roots And Absolute Values
Apr 10 Klamkin's Quickie via Peru Geometrico
Apr 10 Cyclic Inequality with Square Roots
Apr 9 Fun Identity in Right Triangle
Apr 9 An Inequality with a Parameter and a Constraint
Apr 9 Golden Ratio in an Isosceles Trapezoid with a 60 degrees Angle II
Apr 8 A Problem with Two Similar Rectangles
Apr 8 Cultivating Regular Pentagons
Apr 5 Problem 4010 from Crux Mathematicorum
Apr 3 How Do Angle Trisectors Divide the Area?
Apr 1 Gireaux's Theorem
Apr 1 The Law of Cosines and the Law of Sines Are Equivalent
Mar 31 Another Problem from the 2016 Danubius Contest
Mar 31 Concurrent Chords in a Circle, Equally Inclined
Mar 30 Dorin Marghidanu's Inequality with Maximum Side
Mar 29 Inequality with Constraint from Dan Sitaru's Math Phenomenon
Mar 28 Proofs of Schweitzer's inequality
Mar 27 Dan Sitaru's Inequality with Tangents II
Mar 26 Problem 4 From the 2016 Pan-African Math Olympiad
Mar 26 Triangle Area in Square with Incircle
Mar 26 A Cyclic But Not Symmetric Inequality in Four Variables
Mar 25 Applications of Schweitzer's Inequality
Mar 24 An Inequality with Cyclic Sums And Products
Mar 24 Sitaru-Schweitzer Inequality
Mar 23 Rotating Square in Search of the Golden Ratio
Mar 23 A Problem From a Mongolian Olympiad for Grade 11
Mar 23 Hung Viet's Inequality III
Mar 22 An Inequality in Triangle with Sides and Medians II
Mar 22 Inequality with Two Variables? Think Again
Mar 21 Minimum under Two Constraints
Mar 21 Small Change Makes Big Difference
Mar 20 Darij Grinberg's Inequality In Three Variables
Mar 18 Imad Zak's Cyclic Inequality in Three Variables II
Mar 18 Dan Sitaru's Cyclic Inequality In Three Variables with Constraints
Mar 18 The power of substitution III: proving an inequality with two variables
Mar 18 Imad Zak's Cyclic Inequality in Three Variables
Mar 18 Dorin Marghidanu's Cyclic Inequality in Three Variables II
Mar 17 A Case for Determinants
Mar 15 An Inequality with Areas, Norms, and Complex Numbers
Mar 15 An Inequality with a Variety of Circumradii
Mar 14 An Inequality in Triangle, with Sides and Sums
Mar 11 Homothety in Three Tangent Circles II
Mar 11 Homothety in Three Tangent Circles
Mar 10 An Inequality in Triangle, with Sines II
Mar 9 Pentagon And Decagon, Both Regular
Mar 8 A Cyclic Inequality in Three Variables XXII
Mar 8 Angle Bisector in Square
Mar 8 Hung Viet's Inequality II
Mar 7 Regular Pentagon Construction by K. Knop
Mar 7 An Inequality with Just Two Variable VII
Mar 7 Tangent to Circle in Three Steps
Mar 6 A Cyclic Inequality in Three Variables XXI
Mar 6 An Angle in Square Conjoint with Regular Pentagon
Mar 5 A Cyclic Inequality in Three Variables XX
Mar 4 An Acyclic Inequality in Three Variables
Mar 3 An Inequality with Just Two Variables VI
Mar 3 An Inequality in Triangle, with Sines
Mar 2 A Cyclic Inequality in Three Variables XIX
Mar 2 An Inequality in Triangle, with Integrals
Mar 2 Jordan and Kober Inequalities, PWW
Mar 2 Star, Six Pentagons and Golden Ratio
Mar 2 Graphing Equations Is Useful, V
Mar 1 General Butterfly in Pictures
Feb 28 An Identity with Inradius and Circumradii
Feb 27 An Inequality with Just Two Variables V
Feb 26 A Cyclic Inequality in Three Variables XVIII
Feb 26 Pairing Monotone and Convex Functions
Feb 26 FJG Capitan's Sangaku
Feb 25 An Inequality In Triangle and Without II
Feb 25 A Cyclic Inequality in Three Variables XVII
Feb 25 The Beauty of Fractions
Feb 23 Tony Foster's Proof of Viviani's Theorem
Feb 22 Problem 4096 from Crux Mathematicorum
Feb 22 An Inequality with Constraint XVII
Feb 22 Dorin Marghidanu's Example II
Feb 21 An Inequality with Inradius and Circumradii
Feb 21 An Inequality Not in Triangle
Feb 19 Problem 4087 from Crux Mathematicorum
Feb 18 Cubic Optimization with Partly Linear Constraints
Feb 17 Le Khanh Sy's Problem
Feb 17 A Cyclic Inequality in Three Variables XVI
Feb 16 An Inequality with Complex Numbers of Unit Length
Feb 16 An Inequality in Triangle with Differences of the Medians
Feb 15 An Inequality in Triangle with the Circumradius, Inradius and Angle Bisectors
Feb 15 An Inequality in Triangle with the Sines of Half-Angles and Cube Roots
Feb 15 Cubic Optimization with Linear Constraints
Feb 14 A Cyclic Inequality with Many Sums
Feb 13 An Inequality In Triangle with Sines of Half-Angles
Feb 13 An Inequality in Triangle with Medians, Sides and Circumradius
Feb 13 Dorin Marghidanu's Cyclic Inequality with Constraint
Feb 13 Orthic Triangle in a Triangle with a 120 degrees angle
Feb 12 A Cyclic Inequality in Three Variables And One More
Feb 11 An Inequality with Just Two Variables IV
Feb 11 Emil Stoyanov's New Year's Problem, a Sequel
Feb 9 An Inequality In Triangle and Without
Feb 9 An Inequality with Fractions
Feb 8 A Triangle With a 45 Degrees Angle in Square
Feb 8 Dorin Marghidanu's Cyclic Inequality in Three Variables
Feb 8 Golden Ratio in a Mutually Beneficial Relationship
Feb 7 Weitzenbock by Sanchez
Feb 6 An Inequality on Circumscribed Quadrilateral
Feb 6 Stathis Koutras' Butterfly
Feb 6 Igor Sharygin's Problem in Circumscribed Quadrilateral
Feb 6 Dan Sitaru's Cyclic Inequality In Many Variables
Feb 4 A Cyclic Inequality in Three Variables XV
Feb 3 An Inequality with Constraint in Four Variables III
Feb 3 Dan Sitaru's Cyclic Inequality In One Variable
Feb 3 Leo Giugiuc's Inequality for the Medians
Feb 2 Inequalities with Constraint XV and XVI
Feb 2 Cyclic Inequality with Logarithms
Feb 1 An Inequality with Altitudes and Angle Bisectors
Feb 1 An Inequality with Altitudes and Medians
Jan 31 Constrained Inequality with Reciprocals
Jan 30 Divergence of the Harmonic Series (Details)
Jan 30 Converse Construction in Pompeiu's Theorem
Jan 29 Excircle in Equilateral Triangle
Jan 28 Problem 2, the 36th IMO (1995)
Jan 28 An Application of Cauchy-Schwarz Inequality
Jan 27 Tran Hoang Nam's Cyclic Inequality in Three Variables
Jan 27 Early Refinement of the Ionescu-Weitzenbock Inequality
Jan 26 Problem in a Special Trapezoid
Jan 26 Daniel Dan's Optimization in Three Variables
Jan 26 Stathis Koutras' Theorem II
Jan 26 Padoa's Inequality
Jan 25 An Inequality in Triangle with Altitudes, Medians And Symmedians
Jan 24 Leo Giugiuc's Cyclic Inequality in Three Variables
Jan 24 An Inequality with Just Two Variable III
Jan 23 Area Inequality in Three Triangles
Jan 22 Parallel Lines in a Quadrilateral II
Jan 21 An Inequality in Triangle, Mostly with the Medians
Jan 20 Hung Nguyen Viet's Inequality with Radicals and Chebyshev
Jan 19 Question That Changes with Time
Jan 18 Sladjan Stankovik's Inequality With Constraint II
Jan 18 An Inequality in Triangle and In General
Jan 17 Getting Ahead by Two Points
Jan 17 Radicals, Radicals, And More Radicals in an Inequality
Jan 16 Find Minimum without Calculus
Jan 16 A Cyclic Inequality in Three Variables XIV
Jan 16 Isosceles Triangle with Two Points on Base
Jan 14 Angle Chasing in a 75-30-75 triangle
Jan 14 Nine Point Center in Square
Jan 14 An Inequality for the Cevians through Spieker Point via Brocard Angle
Jan 13 Optimization in Four Variables with Two Constraints
Jan 11 An Inequality in Reciprocals III
Jan 10 An Inequality with Determinants VI
Jan 10 A Cyclic Inequality in Three Variables XIII
Jan 10 An Inequality with Constraint XIV
Jan 9 An Exercise without Calculating Aids
Jan 8 A Special Triangle with a Line Through the Lemoine Point
Jan 8 A Case of Divergence
Jan 8 One Inequality - Two Domains
Jan 7 Marian Cucoanes' Inequality With Roots and Powers
Jan 7 A Triple Integral Inequality
Jan 6 A Cyclic Inequality in Three Variables XII
Jan 6 Brocard Point and a Relation of Circumradii
Jan 6 Integrals of a Function And Its Inverse
Jan 6 Adil Abdullayev's Inequality With Roots and Powers
Jan 6 A Cyclic Inequality in Three Variables XI
Jan 5 An Inequality with Constraint in Four Variables II
Jan 5 An Inequality with Powers of Six
Jan 4 Algebraic-Geometric Inequality
Jan 4 A Cyclic Inequality in Three Variables X
Jan 3 From Angle Bisector to 120 degrees Angle
Jan 3 From The Sum of Angles To The Sum of Sines
Jan 2 Average Distance to N Points
Jan 2 A Cyclic Inequality in Three Variables IX
Jan 2 A Cyclic Inequality in Three Variables VIII
Jan 1 Emil Stoyanov's New Year's Problem

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