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In mathematics, the '''Prouhet–Tarry–Escott problem''' asks for two disjoint [[Set (mathematics)|sets]] ''A'' and ''B'' of ''n'' [[integer]]s each, such that: | |||
:<math>\sum_{a\in A} a^i = \sum_{b\in B} b^i</math> | |||
for each integer ''i'' from 1 to a given ''k''.<ref name="Borwein">{{harvnb|Borwein|p=85}}</ref> | |||
This problem was named after {{link-interwiki|lang=fr|en=Eugène Prouhet}}, who studied it in the early 1850s, and [[Gaston Tarry]] and Escott, who studied it in the early 1910s. | |||
The largest value of ''k'' for which a solution with ''n'' = ''k''+1 is known is given by ''A'' = {±22, ±61, ±86, ±127, ±140, ±151}, ''B'' = {±35, ±47, ±94, ±121, ±146, ±148} for which ''k'' = 11.<ref>[http://euler.free.fr/eslp/TarryPrb.htm#Ideal%20symmetric Solution found by Nuutti Kuosa, Jean-Charles Meyrignac and Chen Shuwen, in 1999].</ref> | |||
== Example == | |||
For example, a solution with ''n'' = 6 and ''k'' = 5 is the two sets { 0, 5, 6, 16, 17, 22 } | |||
and { 1, 2, 10, 12, 20, 21 }, because: | |||
: 0<sup>1</sup> + 5<sup>1</sup> + 6<sup>1</sup> + 16<sup>1</sup> + 17<sup>1</sup> + 22<sup>1</sup> = 1<sup>1</sup> + 2<sup>1</sup> + 10<sup>1</sup> + 12<sup>1</sup> + 20<sup>1</sup> + 21<sup>1</sup> | |||
: 0<sup>2</sup> + 5<sup>2</sup> + 6<sup>2</sup> + 16<sup>2</sup> + 17<sup>2</sup> + 22<sup>2</sup> = 1<sup>2</sup> + 2<sup>2</sup> + 10<sup>2</sup> + 12<sup>2</sup> + 20<sup>2</sup> + 21<sup>2</sup> | |||
: 0<sup>3</sup> + 5<sup>3</sup> + 6<sup>3</sup> + 16<sup>3</sup> + 17<sup>3</sup> + 22<sup>3</sup> = 1<sup>3</sup> + 2<sup>3</sup> + 10<sup>3</sup> + 12<sup>3</sup> + 20<sup>3</sup> + 21<sup>3</sup> | |||
: 0<sup>4</sup> + 5<sup>4</sup> + 6<sup>4</sup> + 16<sup>4</sup> + 17<sup>4</sup> + 22<sup>4</sup> = 1<sup>4</sup> + 2<sup>4</sup> + 10<sup>4</sup> + 12<sup>4</sup> + 20<sup>4</sup> + 21<sup>4</sup> | |||
: 0<sup>5</sup> + 5<sup>5</sup> + 6<sup>5</sup> + 16<sup>5</sup> + 17<sup>5</sup> + 22<sup>5</sup> = 1<sup>5</sup> + 2<sup>5</sup> + 10<sup>5</sup> + 12<sup>5</sup> + 20<sup>5</sup> + 21<sup>5</sup>. | |||
==See also== | |||
* [[Thue–Morse sequence#The_Prouhet–Tarry–Escott_problem|Thue–Morse sequence]] | |||
* [[Euler's sum of powers conjecture]] | |||
* [[Beal's conjecture]] | |||
* [[Jacobi–Madden equation]] | |||
* [[Taxicab number]] | |||
* [[Pythagorean quadruple]] | |||
* [[Sums of powers]], a list of related conjectures and theorems | |||
==Notes== | |||
{{reflist}} | |||
==References== | |||
*{{citation | last=Borwein | first=Peter B. | authorlink=Peter Borwein | title=Computational Excursions in Analysis and Number Theory | chapter=The Prouhet–Tarry–Escott problem | pages=85–96 | series=CMS Books in Mathematics | publisher=[[Springer-Verlag]] | year=2002 | isbn=0-387-95444-9 | url=http://books.google.com/?id=A_ITwN13J6YC&pg=85#PPA85,M1 | accessdate=2009-06-16}} Chap.11. | |||
==External links== | |||
*[http://www.nabble.com/Prouhet-Tarry-Escott-problem-td10624352.html Prouhet-Tarry-Escott problem] | |||
*{{mathworld | title = Prouhet-Tarry-Escott problem | urlname = Prouhet-Tarry-EscottProblem }} | |||
{{DEFAULTSORT:Prouhet-Tarry-Escott problem}} | |||
[[Category:Number theory]] | |||
[[Category:Mathematical problems]] |
Revision as of 07:16, 21 January 2014
In mathematics, the Prouhet–Tarry–Escott problem asks for two disjoint sets A and B of n integers each, such that:
for each integer i from 1 to a given k.[1]
This problem was named after Template:Link-interwiki, who studied it in the early 1850s, and Gaston Tarry and Escott, who studied it in the early 1910s.
The largest value of k for which a solution with n = k+1 is known is given by A = {±22, ±61, ±86, ±127, ±140, ±151}, B = {±35, ±47, ±94, ±121, ±146, ±148} for which k = 11.[2]
Example
For example, a solution with n = 6 and k = 5 is the two sets { 0, 5, 6, 16, 17, 22 } and { 1, 2, 10, 12, 20, 21 }, because:
- 01 + 51 + 61 + 161 + 171 + 221 = 11 + 21 + 101 + 121 + 201 + 211
- 02 + 52 + 62 + 162 + 172 + 222 = 12 + 22 + 102 + 122 + 202 + 212
- 03 + 53 + 63 + 163 + 173 + 223 = 13 + 23 + 103 + 123 + 203 + 213
- 04 + 54 + 64 + 164 + 174 + 224 = 14 + 24 + 104 + 124 + 204 + 214
- 05 + 55 + 65 + 165 + 175 + 225 = 15 + 25 + 105 + 125 + 205 + 215.
See also
- Thue–Morse sequence
- Euler's sum of powers conjecture
- Beal's conjecture
- Jacobi–Madden equation
- Taxicab number
- Pythagorean quadruple
- Sums of powers, a list of related conjectures and theorems
Notes
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External links
- Prouhet-Tarry-Escott problem
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