Algebra
Moderator: elim
17 topics • Page 1 of 1
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- Close form of $1+\sum_{j=1}^n j! j$
by elim » Tue Nov 15, 2011 8:21 pm - 1 Replies
- 3824 Views
- Last post by elim
Tue Nov 15, 2011 8:25 pm
- Close form of $1+\sum_{j=1}^n j! j$
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- Pell's equation $m^2 = pn^2+1$ ($p$ is prime)
by elim » Tue Nov 15, 2011 10:50 am - 0 Replies
- 2249 Views
- Last post by elim
Tue Nov 15, 2011 10:50 am
- Pell's equation $m^2 = pn^2+1$ ($p$ is prime)
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- A Collection of special trigonometric identities
by elim » Mon Sep 12, 2011 10:15 am - 1 Replies
- 2316 Views
- Last post by elim
Mon Sep 12, 2011 10:21 am
- A Collection of special trigonometric identities
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- A property of Pythagorean triples
by karka » Tue Aug 02, 2011 10:37 am - 3 Replies
- 2377 Views
- Last post by Keesiaday
Fri Aug 05, 2011 4:05 pm
- A property of Pythagorean triples
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- A property of Harmonic sum
by elim » Fri Aug 05, 2011 7:00 am - 1 Replies
- 2204 Views
- Last post by elim
Fri Aug 05, 2011 7:01 am
- A property of Harmonic sum
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- You have great content!
by SEOSoftware » Fri Jun 17, 2011 8:06 am - 0 Replies
- 2694 Views
- Last post by SEOSoftware
Fri Jun 17, 2011 8:06 am
- You have great content!
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- A problem about decimal number expression
by elim » Tue Feb 15, 2011 10:01 pm - 0 Replies
- 2384 Views
- Last post by elim
Tue Feb 15, 2011 10:01 pm
- A problem about decimal number expression
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- Cubic Equations
by elim » Tue Feb 15, 2011 9:17 pm - 1 Replies
- 2150 Views
- Last post by elim
Tue Feb 15, 2011 9:23 pm
- Cubic Equations
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- Solve $\cos^2 x + \cos^2 2x + \cos^2 3x = 1$
by elim » Tue Feb 15, 2011 8:45 pm - 0 Replies
- 1640 Views
- Last post by elim
Tue Feb 15, 2011 8:45 pm
- Solve $\cos^2 x + \cos^2 2x + \cos^2 3x = 1$
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- Evaluate $\cos 36^{\circ}$
by elim » Tue Feb 15, 2011 8:03 pm - 1 Replies
- 1320 Views
- Last post by elim
Tue Feb 15, 2011 8:31 pm
- Evaluate $\cos 36^{\circ}$
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- $\sum_1^n y_k \sum_1^n (x_k^2/y_k)-(\sum_1^n x_k)^2=\cdots$
by elim » Tue Feb 15, 2011 7:40 pm - 0 Replies
- 1429 Views
- Last post by elim
Tue Feb 15, 2011 7:40 pm
- $\sum_1^n y_k \sum_1^n (x_k^2/y_k)-(\sum_1^n x_k)^2=\cdots$
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- Find $m,n \in \mathbb{N}, \sum_0^m x^k:=P_m(x) |P_m(x^n)$
by elim » Tue Feb 15, 2011 5:09 pm - 0 Replies
- 1480 Views
- Last post by elim
Tue Feb 15, 2011 5:09 pm
- Find $m,n \in \mathbb{N}, \sum_0^m x^k:=P_m(x) |P_m(x^n)$
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- Liouville's theorem (on diophantine approximation)
by elim » Tue Feb 15, 2011 12:25 pm - 1 Replies
- 1230 Views
- Last post by elim
Tue Feb 15, 2011 12:37 pm
- Liouville's theorem (on diophantine approximation)
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- Lagrange's Vector Identity: (a×b)×c = (a·c)b-(b·c)a
by elim » Sun Feb 13, 2011 7:56 am - 1 Replies
- 1194 Views
- Last post by elim
Tue Feb 15, 2011 7:43 am
- Lagrange's Vector Identity: (a×b)×c = (a·c)b-(b·c)a
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- Lagrange's Identity $|a|^2|b|^2=(a\cdot b)^2+|a\wedge b|^2$
by elim » Mon Feb 14, 2011 7:25 am - 0 Replies
- 1429 Views
- Last post by elim
Mon Feb 14, 2011 7:25 am
- Lagrange's Identity $|a|^2|b|^2=(a\cdot b)^2+|a\wedge b|^2$
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- Formula $(Re, Im)(\sqrt{a+ib}) \quad (a,b \in \mathbb{R})$
by elim » Fri Feb 11, 2011 6:49 pm - 1 Replies
- 1252 Views
- Last post by elim
Sat Feb 12, 2011 10:08 am
- Formula $(Re, Im)(\sqrt{a+ib}) \quad (a,b \in \mathbb{R})$
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- Find \({a_n}\) by recursion \(a_1=1/2,\, \sum_{1}^{n} a_i = n^2 a_n\)
by elim » Fri Feb 12, 2010 10:15 am - 1 Replies
- 1096 Views
- Last post by elim
Fri Feb 12, 2010 11:53 am
- Find \({a_n}\) by recursion \(a_1=1/2,\, \sum_{1}^{n} a_i = n^2 a_n\)
17 topics • Page 1 of 1
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