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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: Arne, darij grinberg, harazi, mathmanman, Megus, N.T.TUAN, orl, pbornsztein	5831	22298	Functional equation Today, at 6:04 am ll931110
	Algebra Proposed & Own Problems Problems that you have already solved and you are interested in second opinions or solutions. Moderators: Arne, darij grinberg, harazi, mathmanman, Megus, N.T.TUAN, orl, pbornsztein	3213	12232	Periodic function Today, at 5:52 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: Arne, darij grinberg, harazi, mathmanman, Megus, N.T.TUAN, orl, pbornsztein	270	996	Bounds on functions Mon Jun 29, 2009 4:35 am pco
	Algebra Solved Problems The problems that were discussed and solved in the topics above are moved here. Moderators: Arne, darij grinberg, harazi, mathmanman, Megus, N.T.TUAN, orl, pbornsztein	669	3041	Functional equation, I... Sat Jun 20, 2009 4:54 am ufuk
	Algebra Theorems and Formulas Moderators: Arne, darij grinberg, harazi, mathmanman, Megus, N.T.TUAN, orl, pbornsztein	131	573	useful lemmas for poly... Today, at 5:10 am ridgers
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: darij grinberg, freemind, Megus, N.T.TUAN, orl, pbornsztein	3443	12390	hard Yesterday, at 11:26 pm crazyfehmy
	Combinatorics Proposed & Own Problems Problems that you have already solved and you are interested in second opinions or solutions. Moderators: darij grinberg, freemind, Megus, N.T.TUAN, orl, pbornsztein	2142	7810	subset of (1,2,...,n) Yesterday, at 5:37 am JRav
	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: darij grinberg, freemind, Megus, N.T.TUAN, orl, pbornsztein	203	716	Matrices with every ro... Wed Jul 01, 2009 11:44 pm t0rajir0u
	Combinatorics Solved Problems The problems that were discussed and solved in the topics above are moved here. Moderators: darij grinberg, freemind, Megus, N.T.TUAN, orl, pbornsztein	246	1245	Very hard(at least for... Fri Jun 12, 2009 6:27 am enndb0x
	Combinatorics Theorems and Formulas Theorems and Formulas. Some even with proof :) Moderators: darij grinberg, freemind, Megus, N.T.TUAN, orl, pbornsztein	88	273	Summation 3k choose k Fri Jun 19, 2009 7:24 pm Fermat's Little Turtle
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: darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti	4207	14227	A nice parallelism Today, at 3:34 am jayme
	Geometry Proposed & Own Problems Problems that you have already solved and you are interested in second opinions or solutions. Moderators: darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti	4969	18723	Locus of point P Today, at 4:40 am Kouichi Nakagawa
	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: darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti	267	1013	long for help~ Thu Jun 25, 2009 1:59 pm yetti
	Geometry Solved Problems The problems that were discussed and solved in the topics above are moved here. Moderators: darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti	1414	6336	Trig condition for cyc... Sun Jun 28, 2009 8:40 pm varunrocks
	Geometry Theorems and Formulas Theorems and Formulas. Some even with proof :) Moderators: darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti	292	1331	Vertices of an equilat... Yesterday, at 11:00 am Scorpius
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: Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	5979	28253	sqrtAI + sqrtBI + sqrt... Today, at 12:35 am crazyfehmy
	Inequalities Proposed & Own Problems Problems that you have already solved and you are interested in second opinions or solutions. Moderators: Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	7385	37944	Nice inequality! Today, at 3:42 am crazyfehmy
	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: Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	466	2067	:) Tue Jun 30, 2009 4:52 am caubetoanhoc94
	Inequalities Solved Problems The problems that were discussed and solved in the topics above are moved here. Moderators: Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	795	3749	ABC inequality! Sun Jun 07, 2009 7:48 am cristinarm30
	Inequalities Theorems and Formulas Moderators: Arne, blahblahblah, Cezar Lupu, darij grinberg, harazi, Megus, N.T.TUAN, orl, pbornsztein, pvthuan	246	1962	The UVW-method Sun Jun 28, 2009 2:35 am omegatheo
Number Theory
	PEN Moderators: ideahitme, Peter Sub-forums: General Discussion, Download PEN, Official PEN problems	640	2136	H 86 Sat Jun 27, 2009 6:51 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: amfulger, Arne, darij grinberg, freemind, harazi, Megus, N.T.TUAN, orl, pbornsztein, ZetaX	5363	21765	xyz=8 Yesterday, at 10:25 pm tedy2080
	Number Theory Proposed & Own Problems Problems that you have already solved and you are interested in second opinions or solutions. Moderators: amfulger, Arne, darij grinberg, freemind, harazi, Megus, N.T.TUAN, orl, pbornsztein, ZetaX	3428	13931	A good one Yesterday, at 11:24 pm nguyenvuthanhha
	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: amfulger, Arne, darij grinberg, freemind, harazi, Megus, N.T.TUAN, orl, pbornsztein, ZetaX	529	2335	What's your favorite p... Today, at 2:00 am Stephen
	Number Theory Solved Problems Moderators: amfulger, Arne, darij grinberg, freemind, harazi, Megus, N.T.TUAN, orl, pbornsztein, ZetaX	694	3084	AoPS Challenge 7 Thu Jun 11, 2009 1:31 am bboypa
	Number Theory Theorems and Formulas Theorems and Formulas. Some even with proof :) Moderators: amfulger, Arne, darij grinberg, freemind, harazi, Megus, N.T.TUAN, orl, pbornsztein, ZetaX	234	1050	A strange feature of f... Sun Jun 28, 2009 6:47 am long14893
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	134	1014	mathlinks contest 2009 Sat Jun 20, 2009 6:34 pm math10
	National Olympiads Official questions from national olympiads in each year, containing a pdf file with the questions, and (possibly) results. Moderators: Arne, darij grinberg, N.T.TUAN, orl	661	3088	about the JBMO'09 offi... Yesterday, at 12:16 pm delegat
	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	518	7261	How many exams does yo... Today, at 3:02 am BlackMax
	IMO Shortlist Problems from the IMO Shortlist Moderators: Arne, darij grinberg, orl Sub-forums: View all the IMO Shortlist Problems	52	219	Why IMO Longlists are ... Fri Mar 27, 2009 4:21 pm orl
	Download Problem files for download here; please don't post solutions here! Moderators: orl Sub-forums: German TST	166	583	Help me for the MR Wed Jul 01, 2009 1:19 am math10

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