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Forum		Topics	Posts	Last Post
Algebra
	Algebra Unsolved Problems Problems you couldn't solve and to which you know that there is a solution (i.e. a problem from a contest, etc.) but you don't know it. Moderators: High School Olympiad Moderators	6523	24675	quadratic function Today, at 10:00 am aktyw19
	Algebra Proposed & Own Problems Problems that you have already solved and you are interested in second opinions or solutions. Moderators: High School Olympiad Moderators, Arne, darij grinberg, harazi, mathmanman, Megus, N.T.TUAN, orl, pbornsztein	3554	13504	Nice function Today, at 12:53 pm MJ GEO
	Algebra Open Questions An open question is a question that has no known solution up to this moment, and it is not known wheter the problem has one or not. Moderators: High School Olympiad Moderators, Arne, darij grinberg, harazi, mathmanman, Megus, N.T.TUAN, orl, pbornsztein	298	1087	Bijection such if n\|f(... Thu Nov 19, 2009 7:07 am pco
	Algebra Solved Problems The problems that were discussed and solved in the topics above are moved here. Moderators: High School Olympiad Moderators, Arne, darij grinberg, harazi, mathmanman, Megus, N.T.TUAN, orl, pbornsztein	671	3050	IMO 95 Thu Nov 26, 2009 10:20 pm tiger on prowl
	Algebra Theorems and Formulas Moderators: High School Olympiad Moderators, Arne, darij grinberg, harazi, mathmanman, Megus, N.T.TUAN, orl, pbornsztein	129	557	x^0=1 for all numbers x?? Thu Nov 12, 2009 3:32 am spanferkel
Combinatorics
	Combinatorics Unsolved Problems Problems you couldn't solve and to which you know that there is a solution (i.e. a problem from a contest, etc.) but you don't know it. Moderators: High School Olympiad Moderators, darij grinberg, freemind, Megus, N.T.TUAN, orl, pbornsztein	3718	13339	Union of subsets Today, at 9:43 am pleurestique
	Combinatorics Proposed & Own Problems Problems that you have already solved and you are interested in second opinions or solutions. Moderators: High School Olympiad Moderators, darij grinberg, freemind, Megus, N.T.TUAN, orl, pbornsztein	2326	8433	combinatorics toughie Yesterday, at 2:40 pm pleurestique
	Combinatorics Open Questions An open question is a question that has no known solution up to this moment, and it is not known wheter the problem has one or not. Moderators: High School Olympiad Moderators, darij grinberg, freemind, Megus, N.T.TUAN, orl, pbornsztein	241	808	Operations on an array Mon Nov 23, 2009 2:47 pm kevinatcausa
	Combinatorics Solved Problems The problems that were discussed and solved in the topics above are moved here. Moderators: High School Olympiad Moderators, darij grinberg, freemind, Megus, N.T.TUAN, orl, pbornsztein	246	1249	colouring the plane Tue Dec 01, 2009 2:39 am Melvinlh5
	Combinatorics Theorems and Formulas Theorems and Formulas. Some even with proof :) Moderators: High School Olympiad Moderators, darij grinberg, freemind, Megus, N.T.TUAN, orl, pbornsztein	95	300	permutation. Fri Dec 04, 2009 5:56 am ayush_2008
Geometry
	Geometry Unsolved Problems Problems you couldn't solve and to which you know that there is a solution (i.e. a problem from a contest, etc.) but you don't know it. Moderators: High School Olympiad Moderators, darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti	4777	16215	concyclic points Today, at 11:56 am AndrewTom
	Geometry Proposed & Own Problems Problems that you have already solved and you are interested in second opinions or solutions. Moderators: High School Olympiad Moderators, darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti	5513	20567	4 centroids on a paral... Today, at 10:37 am luisgeometria
	Geometry Open Questions An open question is a question that has no known solution up to this moment, and it is not known wheter the problem has one or not. Moderators: High School Olympiad Moderators, darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti	297	1123	Extension to the Napol... Today, at 12:17 pm vittasko
	Geometry Solved Problems The problems that were discussed and solved in the topics above are moved here. Moderators: High School Olympiad Moderators, darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti	1414	6356	Circumcenters pass thr... Fri Dec 04, 2009 3:16 am sunken rock
	Geometry Theorems and Formulas Theorems and Formulas. Some even with proof :) Moderators: High School Olympiad Moderators, darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti	312	1394	Carnot's Lemma Today, at 3:44 am mathson
Inequalities
	Inequalities Unsolved Problems Problems you couldn't solve and to which you know that there is a solution (i.e. a problem from a contest, etc.) but you don't know it. Moderators: High School Olympiad Moderators, Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	6467	30350	Some more elementary I... Today, at 12:15 pm mahanmath
	Inequalities Proposed & Own Problems Problems that you have already solved and you are interested in second opinions or solutions. Moderators: High School Olympiad Moderators, Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	8313	42168	Fifth degree polynomial Today, at 11:58 am alexilic
	Inequalities Open Questions An open question is a question that has no known solution up to this moment, and it is not known wheter the problem has one or not. Moderators: High School Olympiad Moderators, Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	504	2197	An inequality Today, at 9:16 am duc 95
	Inequalities Solved Problems The problems that were discussed and solved in the topics above are moved here. Moderators: High School Olympiad Moderators, Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	796	3785	may be old and easy Fri Dec 04, 2009 8:20 am TT-P
	Inequalities Theorems and Formulas Moderators: High School Olympiad Moderators, Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	259	2017	Half concave and half ... Yesterday, at 9:03 am kuing
Number Theory
	PEN Moderators: ideahitme, Peter Sub-forums: General Discussion, Download PEN, Official PEN problems	640	2203	I 1 Yesterday, at 8:01 am hxy09
	Number Theory Unsolved Problems Problems you couldn't solve and to which you know that there is a solution (i.e. a problem from a contest, etc.) but you don't know it. Moderators: High School Olympiad Moderators, amfulger, Arne, darij grinberg, freemind, harazi, Megus, N.T.TUAN, orl, pbornsztein, ZetaX	5977	24027	Integer points on Ocho... Today, at 6:21 am MeKnowsNothing
	Number Theory Proposed & Own Problems Problems that you have already solved and you are interested in second opinions or solutions. Moderators: High School Olympiad Moderators, amfulger, Arne, darij grinberg, freemind, harazi, Megus, N.T.TUAN, orl, pbornsztein, ZetaX	3764	15168	find all n :\| Today, at 8:59 am Mathias_DK
	Number Theory Open Questions An open question is a question that has no known solution up to this moment, and it is not known wheter the problem has one or not. Moderators: High School Olympiad Moderators, amfulger, Arne, darij grinberg, freemind, harazi, Megus, N.T.TUAN, orl, pbornsztein, ZetaX	577	2522	Integer Heronian triangle Fri Dec 04, 2009 11:03 am kweenie
	Number Theory Solved Problems Moderators: High School Olympiad Moderators, amfulger, Arne, darij grinberg, freemind, harazi, Megus, N.T.TUAN, orl, pbornsztein, ZetaX	694	3089	Prove that there are i... Sat Oct 24, 2009 9:08 am PhilG
	Number Theory Theorems and Formulas Theorems and Formulas. Some even with proof :) Moderators: High School Olympiad Moderators, amfulger, Arne, darij grinberg, freemind, harazi, Megus, N.T.TUAN, orl, pbornsztein, ZetaX	260	1132	Restricted sum sets Yesterday, at 3:52 pm Dusanm
High-School Contests
	MathLinks Contest The MathLinks Contest is free to anyone in the world under age 20. Find information about it in this forum. Moderators: Arne, darij grinberg, orl Sub-forums: Old MathLinks Contests	138	1032	Contest Sat Oct 31, 2009 1:35 am Bugi
	National Olympiads Official questions from national olympiads in each year, containing a pdf file with the questions, and (possibly) results. Moderators: High School Olympiad Moderators, Arne, darij grinberg, N.T.TUAN, orl	696	3181	RMO paper Tue Dec 01, 2009 10:47 am gouthamphilomath
	International Mathematical Olympiad The supreme competition in high-school mathematics. Usually abbreviated as IMO. Moderators: Arne, darij grinberg, orl Sub-forums: IMO 2009 Germany, Previous IMOs	556	7860	China's unbelievable p... Today, at 9:27 am pleurestique
	IMO Shortlist Problems from the IMO Shortlist Moderators: High School Olympiad Moderators, Arne, darij grinberg, orl Sub-forums: View all the IMO Shortlist Problems	55	214	IMO 1985 LongList Tue Nov 03, 2009 4:08 am TALENTO
	Download Problem files for download here; please don't post solutions here! Moderators: High School Olympiad Moderators, orl Sub-forums: German TST	173	605	Sharygin book Today, at 12:38 am Pocha

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