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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	6514	24643	Polynomial Today, at 9:59 am Rust
	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	3537	13429	Strange function Today, at 10:59 am pco
	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	3713	13329	Combinations Today, at 9:09 am Kono
	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	2324	8430	A Mixed Function Equation Yesterday, at 11:24 pm pmvald
	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. Yesterday, at 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	4769	16184	very easy Today, at 8:29 am sunken rock
	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	5508	20550	help! Today, at 10:01 am MJ GEO
	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	1121	Pentagram open problem 1 Yesterday, at 12:58 pm borislav_mirchev
	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... Yesterday, at 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	311	1393	A synthetic study of a... Sat Nov 28, 2009 7:35 am sunken rock
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	6461	30324	I cannot solve this Today, at 10:53 am manlio
	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	8302	42116	Ineq-Ligouras-088 Today, at 9:50 am Ligouras
	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	2192	hard inequality Today, at 9:37 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 Yesterday, at 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 ... Today, at 9:03 am kuing
Number Theory
	PEN Moderators: ideahitme, Peter Sub-forums: General Discussion, Download PEN, Official PEN problems	640	2203	I 1 Today, 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	5974	24023	bmo 1994 Today, at 10:19 am Rust
	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	3760	15161	Sequence and divisibil... Today, at 10:34 am srinath.r
	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 Yesterday, at 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	259	1131	Inequality for prime n... Tue Dec 01, 2009 5:43 pm ZetaX
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	7855	China's unbelievable p... Today, at 10:29 am ghjk
	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	172	602	Ukrainian journal "in ... Yesterday, at 7:09 am rogue

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