Grinberg's theorem: Difference between revisions

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In [[partition calculus]], part of [[combinatorial set theory]], which is a branch of mathematics, the '''Erdős–Rado theorem'''  is a basic result, extending [[Ramsey's theorem]] to uncountable sets.


==Statement of the theorem==
If r≥2  is finite, κ is an infinite cardinal, then
:<math>
\exp_r(\kappa)^+\longrightarrow(\kappa^+)^{r+1}_\kappa
</math>
where exp<sub>0</sub>(κ)=κ and inductively exp<sub>''r''+1</sub>(κ)=2<sup>exp<sub>''r''</sub>(κ)</sup>. This is sharp in the sense that exp<sub>''r''</sub>(κ)<sup>+</sup> cannot be replaced by exp<sub>''r''</sub>(κ) on the left hand side.


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The above partition symbol describes the following statement. If ''f'' is a coloring of the ''r+1''-element subsets of a set of cardinality exp<sub>''r''</sub>(κ)<sup>+</sup>,  in κ many colors, then there is a homogeneous set of cardinality κ<sup>+</sup> (a set, all whose ''r+1''-element subsets get the same ''f''-value).
 
==References==
*{{citation|mr=0795592
|last=Erdős|first= Paul|author1-link=Paul Erdős|last2= Hajnal|first2= András|author2-link=András Hajnal|last3= Máté|first3= Attila|last4= Rado|first4= Richard|author4-link=Richard Rado
|title=Combinatorial set theory: partition relations for cardinals
|series=Studies in Logic and the Foundations of Mathematics|volume= 106|publisher= North-Holland Publishing Co., |place=Amsterdam|year= 1984| isbn= 0-444-86157-2 }}
*{{citation|mr=0081864
|last=Erdős|first= P.|author1-link=Paul Erdős|last2= Rado|first2= R.|author2-link=Richard Rado
|title=A partition calculus in set theory.
|journal=Bull. Amer. Math. Soc. |volume=62 |year=1956|pages= 427–489
|url=http://www.ams.org/bull/1956-62-05/S0002-9904-1956-10036-0/|doi=10.1090/S0002-9904-1956-10036-0}}
 
{{DEFAULTSORT:Erdos-Rado theorem}}
[[Category:Set theory]]
[[Category:Theorems in combinatorics]]
[[Category:Paul Erdős]]

Revision as of 06:03, 20 March 2013

In partition calculus, part of combinatorial set theory, which is a branch of mathematics, the Erdős–Rado theorem is a basic result, extending Ramsey's theorem to uncountable sets.

Statement of the theorem

If r≥2 is finite, κ is an infinite cardinal, then

where exp0(κ)=κ and inductively expr+1(κ)=2expr(κ). This is sharp in the sense that expr(κ)+ cannot be replaced by expr(κ) on the left hand side.

The above partition symbol describes the following statement. If f is a coloring of the r+1-element subsets of a set of cardinality expr(κ)+, in κ many colors, then there is a homogeneous set of cardinality κ+ (a set, all whose r+1-element subsets get the same f-value).

References

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    Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.

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