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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	6357	24134	functional equation Today, at 5:43 pm Vincent Gilbert
	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	3474	13206	not easy functional sy... Today, at 3:13 pm Diogene
	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	294	1074	system of equations Yesterday, at 2:36 pm mrmohamed
	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	3048	Prove that they are equal Mon Oct 12, 2009 10:20 pm manosij
	Algebra Theorems and Formulas Moderators: High School Olympiad Moderators, Arne, darij grinberg, harazi, mathmanman, Megus, N.T.TUAN, orl, pbornsztein	128	554	Func_Equation Wed Oct 14, 2009 1:47 am hungvuong
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	3654	13151	distances Today, at 10:45 pm mavropnevma
	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	2288	8323	How many are there? Today, at 4:46 pm mathVNpro
	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	240	807	Triangulated planar gr... Wed Nov 04, 2009 5:33 am kweenie
	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	1248	colouring the plane Sat Oct 03, 2009 8:02 am mavropnevma
	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	91	289	Proof of 4-Color Theorem Fri Nov 06, 2009 3:45 am kweenie
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	4686	15882	seems like a pythagore... Today, at 8:06 pm dgreenb801
	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	5431	20268	Hard problem Today, at 10:36 pm livetolove212
	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	294	1095	Pentagram open problem 2 Today, at 2:44 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	6352	Cyclic points Fri Oct 23, 2009 4:41 am dgreenb801
	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	306	1374	collinearity, concycli... Wed Nov 04, 2009 6:54 am Anthony2
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	6368	29881	An ineq related to log... Today, at 7:09 pm panyi2009
	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	8127	41323	Can_hang's stronger one Today, at 10:44 pm fjwxcsl
	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	499	2180	Simple Inequality Problem Today, at 7:57 am spanferkel
	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	3772	may be old and easy Sat Oct 24, 2009 12:27 am Ji Chen
	Inequalities Theorems and Formulas Moderators: High School Olympiad Moderators, Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	255	2010	secrets in inequalitie... Today, at 5:43 am Pain rinnegan
Number Theory
	PEN Moderators: ideahitme, Peter Sub-forums: General Discussion, Download PEN, Official PEN problems	640	2195	A 70 Fri Nov 06, 2009 11:23 pm 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	5863	23604	Find sum x^2 + y ^2 si... Today, at 8:35 pm ngoclam1088
	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	3687	14891	product of digit Today, at 7:32 pm Johan Gunardi
	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	573	2501	own(?) Yesterday, at 4:33 am wauwau
	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	255	1118	On a nice theorem Yesterday, at 7:43 am nayel
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	689	3168	Polish MO Round 3 2009 Mon Nov 02, 2009 11:26 pm math10
	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	553	7837	IMO 2006 Slovenia - PR... Mon Nov 02, 2009 8:22 am Altunshukurlu
	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	171	599	Russia 2002 Sun Nov 01, 2009 3:18 pm math10

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