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Difference between revisions of "Absorbing state"

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''of a Markov chain <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/a/a010/a010430/a0104301.png" />''
 
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A state <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/a/a010/a010430/a0104302.png" /> such that
 
A state <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/a/a010/a010430/a0104302.png" /> such that

Revision as of 19:41, 27 January 2012

of a Markov chain

2020 Mathematics Subject Classification: Primary: 60J10 [MSN][ZBL]

A state such that

An example of a Markov chain with absorbing state is a branching process.

The introduction of additional absorbing states is a convenient technique that enables one to examine the properties of trajectories of a Markov chain that are associated with hitting some set.

Example. Consider the set of states of a homogeneous Markov chain with discrete time and transition probabilities

in which a subset is distinguished and suppose one has to find the probabilities

where is the moment of first hitting the set . If one introduces the auxiliary Markov chain differing from only in that all states are absorbing in , then for the probabilities

are monotonically non-decreasing for and

(*)

By virtue of the basic definition of a Markov chain

The passage to the limit for taking into account (*) gives a system of linear equations for :

References

[1] W. Feller, "An introduction to probability theory and its applications" , 1 , Wiley (1968)
How to Cite This Entry:
Absorbing state. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Absorbing_state&oldid=20600
This article was adapted from an original article by A.M. Zubkov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article