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We provide a simple proof for the extended Bertrand–De Morgan test that was earlier studied in [ÄŽuriÅ¡, F., (2009). Infinite series: Convergence tests. Bachelor thesis, Univerzita Komenského, ...
David Levin, On Accelerating the Convergence of Infinite Double Series and Integrals, Mathematics of Computation, Vol. 35, No. 152 (Oct., 1980), pp. 1331-1345 ...