# Gauss criterion

From Encyclopedia of Mathematics

*Gauss test*

A convergence criterion for a series of positive numbers

If the ratio can be represented in the form

(*) |

where and are constants, and is a bounded sequence, then the series converges if and diverges if . For equation (*) to be valid it is necessary (but not sufficient) for the finite limit

or

to exist. Gauss' criterion was historically (1812) one of the first general criteria for convergence of a series of numbers. It was employed by C.F. Gauss to test the convergence of the hypergeometric series. It is the simplest particular case of a logarithmic convergence criterion.

#### Comments

The criterion is usually stated in the simpler form with , cf. [a1], p. 297.

#### References

[a1] | K. Knopp, "Theorie und Anwendung der unendlichen Reihen" , Springer (1964) pp. 324 (English translation: Blackie, 1951 & Dover, reprint, 1990) |

**How to Cite This Entry:**

Gauss criterion.

*Encyclopedia of Mathematics.*URL: http://encyclopediaofmath.org/index.php?title=Gauss_criterion&oldid=17936

This article was adapted from an original article by L.P. Kuptsov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article