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Quarterly of Applied Mathematics

Quarterly of Applied Mathematics

Online ISSN 1552-4485; Print ISSN 0033-569X

   
 
 

 

On the completely positive kernels for nonuniform meshes


Authors: Yuanyuan Feng and Lei Li
Journal: Quart. Appl. Math.
MSC (2020): Primary 45D05, 65R20
DOI: https://doi.org/10.1090/qam/1684
Published electronically: November 29, 2023
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Abstract: The complete positivity for convolutional kernels is an important property for the positivity property and asymptotic behaviors of Volterra equations. We investigate the discrete analogue of the complete positivity properties, especially for convolutional kernels on nonuniform meshes. Through an operation which we call pseudo-convolution, we introduce the complete positivity property for discrete kernels on nonuniform meshes and establish the criterion for the complete positivity. We then apply our theory to the L1 discretization of time fractional differential equations on nonuniform meshes.


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Additional Information

Yuanyuan Feng
Affiliation: School of Mathematical Sciences, Key Laboratory of MEA (Ministry of Education) and Shanghai Key Laboratory of PMMP, East China Normal University, Shanghai 200241, People’s Republic of China
MR Author ID: 1265454
Email: yyfeng@math.ecnu.edu.cn

Lei Li
Affiliation: School of Mathematical Sciences, Institute of Natural Sciences, MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Email: leili2010@sjtu.edu.cn

Received by editor(s): September 8, 2023
Received by editor(s) in revised form: November 5, 2023
Published electronically: November 29, 2023
Additional Notes: This work was financially supported by the National Key R&D Program of China, Project Number 2021YFA1002800 and 2020YFA0712000. The work of the first author was partially sponsored by NSFC 12301283, Shanghai Sailing program 23YF1410300 and Science and Technology Commission of Shanghai Municipality (No. 22DZ2229014). The work of the second author was partially supported by NSFC 12371400 and 12031013, Shanghai Science and Technology Commission (Grant No. 21JC1403700, 20JC144100), the Strategic Priority Research Program of Chinese Academy of Sciences, Grant No. XDA25010403.
The second author is the corresponding author.
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