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A state is periodic if it is contained only in cycles in which the gcd of the cycle lengths is greater than one. A Markov process is irreducible if it consists of a single strongly connected component. An ergodic state is one that is aperiodic and persistent. A Markov chain is ergodic if all states are ergodic. In graph theory this corresponds to a single strongly connected component that is aperiodic.

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A state is periodic if it is contained only in cycles in which the gcd of the cycle lengths is greater than one.
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ΪʲôҪÓÐthe gcd of the cycle lengths Õâ¸ö¸ÅÄ

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the gcd of the cycle lengths

gcd  - ?????, the greatest common divisor (g.c.d)

?h¡¤(cycle)

???]?o??DG V = ( , E)???????x y − ¡¤??
(a) ?? x − y¡¤?o?¦Ê??????????t(?????c)?¦Ã?
??l x − y¡¤??(trail)???] x x − ¡¤???Q???¡¤(circuit)??
(b) ??? x − y¡¤?o?¦Ê???c???F?????????Q??x − y
¡¤??(path)???h¡¤(cycle)??~???????????l?]¡¤????

http://www.stat.nuk.edu.tw/cbme/discrete/search.htm
2Â¥2016-08-06 21:26:17
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G is strongly connected and the the GCD of the cycle lengths in G is 1.

Convergence on Directed Graphs
http://citeseerx.ist.psu.edu/vie ... p1&type=pdf

Strongly connected component
https://en.wikipedia.org/wiki/Strongly_connected_component
3Â¥2016-08-06 21:33:09
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