Local analysis - Revision history

Karl Jones at 00:54, 26 April 2016

2016-04-26T00:54:33Z

Karl Jones at 12:24, 20 February 2016

2016-02-20T12:24:27Z

Karl Jones: /* See also */

2016-02-20T12:23:01Z

‎See also

Karl Jones: Created page with "In mathematics, the term '''local analysis''' has at least two meanings, both derived from the idea of looking at a problem relative to each prime number p first, and then..."

2016-02-20T12:22:35Z

Created page with "In mathematics, the term '''local analysis''' has at least two meanings, both derived from the idea of looking at a problem relative to each prime number p first, and then..."

New page

In [[mathematics]], the term '''local analysis''' has at least two meanings, both derived from the idea of looking at a problem relative to each prime number p first, and then later trying to integrate the information gained at each prime into a 'global' picture.

== Group theory ==

In [[group theory]], local analysis was started by the Sylow theorems, which contain significant information about the structure of a finite group G for each prime number p dividing the order of G. This area of study was enormously developed in the quest for the classification of finite simple groups, starting with the Feit–Thompson theorem that groups of odd order are solvable.

== Number theory ==

In [[number theory]] one may study a [[Diophantine equation]], for example, modulo p for all primes p, looking for constraints on solutions.

The next step is to look modulo prime powers, and then for solutions in the p-adic field.

This kind of local analysis provides conditions for solution that are necessary.

In cases where local analysis (plus the condition that there are real solutions) provides also sufficient conditions, one says that the Hasse principle holds: this is the best possible situation.

It does for quadratic forms, but certainly not in general (for example for elliptic curves).

The point of view that one would like to understand what extra conditions are needed has been very influential, for example for cubic forms.

See [[Localization of a ring]].

== See also ==

* [[Category:Localization (mathematics)]]
* [[Diophantine equation]]
* [[Group theory]]
* [[Localization of a ring]]
* [[Number theory]]

== External links ==

* [https://en.wikipedia.org/wiki/Local_analysis Local analysis] @ Wikipedia

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 == Number theory ==
-In [[number theory]] one may study a [[Diophantine equation]], for example, modulo p for all primes p, looking for constraints on solutions.
+In [[number theory]] one may study a [[Diophantine equation]], for example, modulo p for all [[Prime number|primes]] p, looking for constraints on solutions.
 The next step is to look modulo prime powers, and then for solutions in the p-adic field.

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 == See also ==
 * [[Diophantine equation]]
 * [[Group theory]]
 * [[Localization of a ring]]
 * [[Number theory]]