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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	6420	24324	set of rational numbers Today, at 1:07 pm Jumbler
	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	3506	13307	Hard functional equation Today, at 5:44 am k.l.l4ever
	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(... Yesterday, at 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	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	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	3679	13217	enumeration of euler c... Today, at 8:37 am Storophanthus
	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	2308	8379	Difference between num... Wed Nov 18, 2009 1:11 pm kevinatcausa
	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	92	290	another form of Polya'... Mon Nov 16, 2009 12:44 am Storophanthus
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	4713	15979	points H and K Today, at 12:45 pm jrrbc
	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	5462	20358	An interesting and nic... Today, at 10:41 am Virgil Nicula
	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	295	1105	Pentagram open problem 1 Yesterday, at 3:27 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	6353	let ABC [centroid of e... Yesterday, at 10:22 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	308	1379	Geometry - from basics... Today, at 9:23 am Rijul saini
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	6404	30036	Logarithms Today, at 12:24 pm Spribo
	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	8192	41619	lipako+21 Today, at 2:25 pm bakerbakura
	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	500	2186	arrange Tue Nov 17, 2009 4:33 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	3777	Famous 1996 Iran inequ... Yesterday, at 9:08 am Pain rinnegan
	Inequalities Theorems and Formulas Moderators: High School Olympiad Moderators, Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	258	2016	théoreme Mon Nov 16, 2009 9:32 am mavropnevma
Number Theory
	PEN Moderators: ideahitme, Peter Sub-forums: General Discussion, Download PEN, Official PEN problems	640	2199	D 2 Wed Nov 11, 2009 3:58 am FelixD
	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	5931	23854	p divides a^5+b^5+c^5 Today, at 2:01 pm Jumbler
	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	3726	15023	Prime divisor Today, at 7:25 am shoki
	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	574	2505	Distinct powers of 3, ... Tue Nov 10, 2009 2:56 pm sdkudrgn88
	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	256	1120	\frac{x^n-1}{x-1}=y^2 Tue Nov 17, 2009 7:38 am shoki
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	694	3176	Will Vornicu sell Math... Wed Nov 18, 2009 11:26 pm theSA
	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	7838	Problem 3 (First Day) Wed Nov 18, 2009 11:02 pm Agr_94_Math
	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	601	Mathematical circle Today, at 2:32 am math12061992

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