Give information about Ramanujan the mathematitian?
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He was from India, and brilliant and self-taught. He moved to England, but he became ill there and died when he was very young.\n\n Why don't you do some web searching?
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!!, !!!!!!!! are "multifactorials". They are described in the first attached article.\n\nBriefly,\nn!! = 1 for n=0 or 1,\nn!! = n * (n-2)!! for n>=2.\n\nn!!...! (k "!" signes) = 1, for n<k\nn!!...! (k "!" signes) = n * (n-k)!!...! (k "!" signes)\n\n(2n)!! = n! * 2^n\n(kn)!!...! (k "!" signes) = n! * k^n\n\nSo, we have\n1) 6! = 1*2*3*4*5*6 = 720\n2) 6!! = 2*4*6 = 48\n3) 0! = 1\n4) 5!! = 1*3*5 = 15\n(5!!)!! = 15!! = 1*3*5*7*9*11*13*15 = 2027025\n\nOther factorials are too huge to compute precisely, but we can evaluate them using Stirling formula (second article)\nln n! ~= n*(ln n) - n + (ln(2*pi*n))/2 + 1/(12*n)\n\n5) 5! = 120\n(5!)! = 120! =~ e^(120*ln(120) - 120 + (ln(2*pi*120))/2 + 1/(12*120)) =~ e^457,81 =~ 6.69*10^198\n6) 1234!!!!!!!! = 1234 * 1233 * 1232!!!!!!!! =\n= 1521522 * (154*8)!!!!!!!! =\n= 1521522 * 154! * 8^154 = e^972.43 =~ 2.1*10^422\n\nThus, 6!! - 6! + (5!)! - 1234!!!!!!!! - 0! + (5!!)!! =\n=~ 48 - 720 + 6.69*10^198 - 2.1*10^422 - 1 + 2027025 =~ -2.1*10^422\n\nAnswer: about -2.1*10^422
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The modular (and clock) arithmetic answers are correct, but I think they miss the point a bit, since in any modular arithmetic you still have 2+2 = 4 mod n. Let's suppose we are using the natural numbers with the usual addition.\n\nThe recurring decimal answers are just stupid, 1 = 0.9999... recurring (as shown in fact by the first answer here), so all of these answers are either irrelevant or wrong.\n\nThe '2' is just a symbol arguments possibly have some merit, but you should be careful. In Indianna in 1872 (or thereabouts) it was ruled by State legislature, that the value of pi is 4. Obviously this creates problems, if you go to Indianna you won't find many buildings that were designed in 1872. (Their mistake of course was that they didn't alter the representation of all the other numbers they where using accordingly).\n\nI'm not really a logician so I don't know the answer to this off the top of my head, I'm pretty sure that we don't have a satisfying answer here (sorry if we have but I missed it). \n\nPerhaps a good place to start looking for a serious discussion on this kind of topic would be to understand what a Peano system is (wiki it, I'm not explaining that here, 'tis an axiomatic description of the natural numbers). I've also heard that Bertrand Russell gave a proof that 1+1 =2 in Principa Mathematica, although I haven't read that and I don't know precisely where you can find it.
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Try this:\nhttp://www.wtamu.edu/academic/anns/mps/math/mathlab/beg_algebra/beg_alg_tut9_bar.htm
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Check out this web page: http://mathworld.wolfram.com/Net.html
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umm none that im aware of, what kind of mathamatics leval are you looking at?
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http://www.mathcymru.org/english/thatsoddans.html
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This geometric trick is very involving:\nYou can use it as a starting point for geometric construction of square roots, equivalence of areas and isometric transforms\nhttp://answers.yahoo.com/question/?qid=1006030501625\n\nThis other about divisibility and prime factoring of integers has deep mathematical concepts beyond it: starting from it you can speak about prime factoring, bynary count, combinatory calculus and mathematical induction\nhttp://answers.yahoo.com/question/?qid=1006022300298&r=w\n\nI'm going to use them in my school classes
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http://mathworld.wolfram.com/EulerNumber.html
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The best site which provides biography of mathematicians of ancient indian and others is the following one.\n\nhttp://www-gap.dcs.st-and.ac.uk/~history/\n\nCheck this out. And you will be amazed to see the amount of inofrmations available with the site.
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Please visit http://mathforum.org/library/drmath/view/52240.html
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http://thesaurus.maths.org/mmkb/entry.html?action=entryById&id=3206\n\nhttp://mathforum.org/library/drmath/view/51899.html\n\nhttp://www-staff.mcs.uts.edu.au/~don/pubs/solving.html\n\nhttp://thesaurus.maths.org/mmkb/entry.html?action=entryById&id=3206
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numbers, statistics, algerbra, formulae, graphs, calculator qustions
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http://mathworld.wolfram.com/
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http://www.nwahindutemple.org/bhajans/navarathri.doc
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Attached couple of links\n\nApart from these you can buy the book Primer on Logarithms (ISBN 8173714142)
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I don't think these have a name, and I've never run across them before.  However, so long as you don't mind changing the format around, they look easy to create on the computer or anywhere, really.\n\nletter one: 3+4/2\nletter two: 2x+3 = 51 (hint: that's the letter x, not a multiplication symbol)\nletter three: 1*(5-4)\nletter four: the next prime number after 11\nletter five: add 3 to the answer to letter four\nletter six: 4+4*2\nletter seven: this letter is congruent with letter one\n\nThe answer is:\n\nletter one: 3+4/2 = 5 (remember BEDMAS order of opperations: brackets, exponents, divide, multiply, add, subtract) = e (e is the fifth letter of the alphabet)\n\nletter two: remember x?  Let's solve for x:\n2x+3 = 51\n2x = 51-3 (we changed sides of the equation, so we need to change its sign)\n2x = 48 (we knew all the numbers on the right side of the equals sign, so we can solve it!)\nx = 48/2 (we moved the 2, so we need to change the sign, remember)\nx = 24\nNow, if we think about the alphabet, we know that x is the 24th letter.  so...x = x!  :-)\n\nletter 3: 1*(5-4) = 1*1 = 1 = a(Did you remember about BEDMAS from above?)\n\nletter 4: A prime number is a number who's only factors are 1 and itself, for example 7.  We know that 2*6 = 12.  So, 12 can't be prime.  But 13 is!  The 13th letter of the alphabet is, of course, m.\n\nletter five: 13+3 = 16 = p. (You got letter four correct, right?)\n\nletter six: 4+4*2 = 12  = l (BEDMAS is rather important, you know.)\n\nletter seven: Congruent is a math term we use in geometry.  It means two shapes that are exactly the same.  So, i letter seven is exactly the same as letter one, it must also be...e!  \n\nIf you did everything right, the word you get is: example\n\nWasn't that fun?  Wish I had thought of this.