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November 6th, 2017, 11:56 AM   #1
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I need to understand and help for a proof

Find a closed formula for the sum f(n) = 1^4 + 2^4 + 3^4 + . . . + n^4
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November 6th, 2017, 12:04 PM   #2
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http://mathforum.org/library/drmath/view/56935.html
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November 7th, 2017, 01:06 AM   #3
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The formula is n(n + 1)(2n + 1)(3n² + 3n - 1)/30, which can be proved by mathematical induction.
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