supported by National Sciences and Engineering Research Council of Canada;National Natural Science Foundation of China (Grant No. 10471130)
Chaundy and Jolliffe proved that if {a n } is a non-increasing (monotonic) real sequence with lim n →∞ a n = 0, then a necessary and sufficient condition for the uniform convergence of the series ∑∞ n=1 a n sin nx...
NSERC RCD grant and AARMS of Canada (Yu D S);by NSERC of Canada(Zhou P);by the National Natural Science Foundation of China (Grant No. 10471130);the Open Fund(Grant No. PLN0613) of State Key Laboratory of Oil;Gas Reservoir Geology and Exploitation (Southwest Petroleum University) (Zhou S P)
We discuss the relations among the best approximation En(f) and the Fourier coeffcients of a function, f(n) ∈ C,n = 0,±1,±2,..., under the conditions that {f (n)}∞n=0 ∈ MVBVS* and {f (n) + f(n)}∞n=0 ∈ MVBVS*, w...
The work is supported by Zhejiang Provincial Natural Science Foundations(No.Y604359); National Natural Science Foundation of China (No.10371123,10471130).
A computable expression of the asymptotic expansion of the return map for a degenerate singular point of a class of planar differential system is given, and hence the stability and the type of the singular point can b...
We investigate some conditions in Fourier analysis as a generalization of monotonicity condition. Especially, we give some applications of GBVS and sequences satisfy the condition ΔB1 and ΔB2.