August 29th, 2013, 05:53 PM  #21 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Express a cube as sum of squares ....
Both of those formulas, as written, are false. Perhaps you meant to sum up to something other than n1?

August 29th, 2013, 10:56 PM  #22  
Math Team Joined: Mar 2012 From: India, West Bengal Posts: 3,871 Thanks: 86 Math Focus: Number Theory  Re: Express a cube as sum of squares .... Quote:
 
August 30th, 2013, 12:41 AM  #23  
Senior Member Joined: Mar 2012 From: Belgium Posts: 654 Thanks: 11  Re: Express a cube as sum of squares .... Quote:
 
August 30th, 2013, 04:19 AM  #24  
Member Joined: Apr 2013 Posts: 70 Thanks: 0  Re: Express a cube as sum of squares .... Quote:
I mistaped n instead of k assuming that n even is equal to 2k and n odd =2k+1 So you sum up to 2(k1). Edited twice  
August 30th, 2013, 04:22 AM  #25 
Member Joined: Apr 2013 Posts: 70 Thanks: 0  Re: Express a cube as sum of squares ....
Correction 2 When n is even =2k n^3 = 6*(sigma(2i^2) with i=1 to 2(k1)) +3n^22n When is n is odd =2k+1 n^3=6*(sigma((2i+1)^2) with i=0 to 2(k1)) +3n^22n In Latex it will be great. 
August 30th, 2013, 04:24 AM  #26  
Member Joined: Apr 2013 Posts: 70 Thanks: 0  Re: Express a cube as sum of squares .... Quote:
 
August 30th, 2013, 04:26 AM  #27 
Member Joined: Apr 2013 Posts: 70 Thanks: 0  Re: Express a cube as sum of squares ....
So nothing new. The formula seems to be known. Is it useful? 
August 30th, 2013, 04:36 AM  #28 
Member Joined: Apr 2013 Posts: 70 Thanks: 0  Re: Express a cube as sum of squares ....
Sorry!!!!!!!!!!!!!! Sum up to 2(k1) not n1 
August 30th, 2013, 10:25 AM  #29  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Express a cube as sum of squares .... Quote:
 
August 30th, 2013, 10:26 AM  #30  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Express a cube as sum of squares .... Quote:
 

Tags 
cube, express, squares, sum 
Search tags for this page 
sum of two squares is a cube,cubes that are the sum of two squares,sum of square cube of 2,number expres sum of two cube,Express cos4A in terms of sinA,the sum of two cubes is the sum of two squares,sum of squares and cubes algebra sigma,cube sum of two squares,logic of integer no.s n and n squar,n cube......,express cube maths
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Express cos(4a) + sin(4a) using only cos(a) and sin(a)  king.oslo  Algebra  3  September 6th, 2013 12:09 PM 
math question (cube, cube volume, percent)  yano  Algebra  8  March 25th, 2010 05:40 PM 
Is it possible to express this as a function?  squidgy_wiji  Advanced Statistics  8  August 17th, 2009 10:36 PM 
Express As Function  symmetry  Algebra  4  June 3rd, 2007 12:57 PM 
math question (cube, cube volume, percent)  yano  Applied Math  4  December 31st, 1969 04:00 PM 