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math.GM2008
A New Differential Test for Series of Positive Terms
Yi-Fang Chang
A new differential test for series of positive terms is proved. Let f(x) be a positive continuous function corresponded to a series of positive terms f(k), and g(x) is a derivative…
math.GM2007★ 3 cited
Some Nonlinear Equations with Double Solutions: Soliton and Chaos
Yi-Fang Chang
The fundamental characteristics of soliton and chaos in nonlinear equation are completely different. But all nonlinear equations with a soliton solution may derive chaos. While onl…