Bertrand's Test
A Convergence Test also called de Morgan's and Bertrand's Test. If the ratioof terms of a Series 
can be written in the form
then the series converges if
and diverges if 
, where 
is the Lower Limit and
is the Upper Limit.See also Kummer's Test
References
Bromwich, T. J. I'a and MacRobert, T. M. An Introduction to the Theory of Infinite Series, 3rd ed. New York: Chelsea, p. 40, 1991.
- Toeplitz Matrix
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