The Riemann hypothesis, as well as other mathematical conjectures can be found on this website: http://www.claymath.org/millennium/
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The subject is very complicated. On this theme there is a avery good divulgation book published by a great mathematician, Marcus Du Sautoy, "The Music of the Primes". It is a pure delice!
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There is a proof contained in my link, using the Fourier series.
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See for example these places:\n\nhttp://www.analyzemath.com/\n(Interesting interacctive math. graphics)\n\nhttp://mcraefamily.com/MathHelp/\nhttp://mcraeclan.com/MathHelp/GeometryHyperbolicTrigFunctions.htm
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You can find a bunch of them in this website:\nhttp://www.mathpuzzle.com/
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http://en.wikipedia.org/wiki/Japanese_mathematics
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www.aaamath.com i hope I helped
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http://mathworld.wolfram.com/SieveofEratosthenes.html
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http://www.aaamath.com/
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The following site has the answer
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http://mathforum.org/library/drmath/sets/high_calculus.html
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Fermat's Last Theorem has been solved ashas the Four Color Theorem. The Poincare conjecture has recently been solved. Trisecting a general angle with unmarked straightedge and compass has been shown to be unsolvable (although it is possible with marked straightedge and compass).\n\nHigh on the list of open problems:\n\nRiemann Hypothesis.\nP=NP?\nTwin prime conjecture.\nAre there any odd perfect numbers?\nProof of existence of solutions to Navier-Stokes equations.
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You should go to www.AAAMath.com  good luck
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http://mathforum.org/dr.math/ --- basically for all questions regarding math.
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I have seen dozens of math sites on the web, and yes not all are free, but they are there.  Google it out.
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View source of the that page.\nYou will see the formulas.
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good luck man... http://mathforum.org/library/drmath/sets/high_calculus.html
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I have a website devoted to HP theories.  Check it out.\nhttp://rpccstudent.tripod.com/