network profile
| bio | website | |
|---|---|---|
| location | Washington, DC | |
| age | 18 | |
| visits | member for | 1 year, 11 months |
| seen | May 8 at 23:53 | |
| stats | profile views | 38 |
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Feb 27 |
comment |
Wolfram Alpha's Mysterious Trig Abilities… I like this because it's so visual. Accepted! |
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Feb 27 |
accepted | Wolfram Alpha's Mysterious Trig Abilities… |
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Feb 27 |
suggested | suggested edit on How would I apply the limit laws to $\lim_{x\to 2}\frac{(3x-6)\sqrt{x^2+1}}{5x-10}$? |
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Feb 27 |
comment |
Wolfram Alpha's Mysterious Trig Abilities… why do this instead of using the sum->product formula? |
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Feb 27 |
comment |
Wolfram Alpha's Mysterious Trig Abilities… I don't know why this got so many votes... It was just a small error in arithmetic. |
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Feb 27 |
revised |
Wolfram Alpha's Mysterious Trig Abilities… deleted 250 characters in body |
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Feb 27 |
comment |
Wolfram Alpha's Mysterious Trig Abilities… @Ted forgot to omit that irrelevant part of the question. Fixed |
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Feb 27 |
revised |
Wolfram Alpha's Mysterious Trig Abilities… added 2 characters in body |
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Feb 27 |
asked | Wolfram Alpha's Mysterious Trig Abilities… |
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Jan 9 |
awarded | Popular Question |
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Aug 17 |
comment |
Ways to define a curve @JayeshBadwaik Yes, they are |
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Aug 17 |
awarded | Promoter |
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Aug 17 |
accepted | Calculating Distance of a Point from an Ellipse Border |
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Aug 17 |
revised |
Ways to define a curve added 160 characters in body; edited tags |
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Aug 17 |
accepted | Summation of an Arithmetic, Parametric Sequence |
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Aug 17 |
comment |
Summation of an Arithmetic, Parametric Sequence Ok, but that still doesn't answer my first question. How EXACTLY did you get from D(n,r) = D(n−1,r) +(n−r) to the addition of those two summations (i and j)? |
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Aug 16 |
comment |
Summation of an Arithmetic, Parametric Sequence Also, if I may prick your brain =), how did you so quickly realize that D(n,r) equaled D(n-r,0) + D(r,r) or that D(n,n) equaled n(n+1)/2 or that D(n-1, r) + (n-r) equaled D(n-1,r-1) + r? Are there some generic rules I'm not aware of? |
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Aug 16 |
comment |
Summation of an Arithmetic, Parametric Sequence Thanks for sharing your insight, but I'm still a bit confused. I thought you'd have to take D(n-1,r) out of the equation in order to perform summation since it merely acts as a symbol for recursive addition of all preceding terms (which is taken care of by the summation). According to your answer, SUM(n-r) is equal to SUM(D(n-1,r-1)) while SUM(r) is equal to SUM(D(n-1,r)). I don't see how D(n-1,r) and D(n-1,r-1) could have any direct value considering they are just indicators that the sequence needs to be summed. |
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Aug 16 |
asked | Summation of an Arithmetic, Parametric Sequence |
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Apr 15 |
accepted | Finding the computational complexity of an algorithm |
