On Discontinuous and Continuous Approximations to Second-Kind Volterra Integral Equations  

作　　者：Hui Liang 

机构地区：[1]School of Science,Harbin Institute of Technology,Shenzhen,518055,China

出　　处：《Numerical Mathematics(Theory,Methods and Applications)》2022年第1期91-124,共34页高等学校计算数学学报（英文版）

基　　金：supported by the National Nature Science Foundation of China(No.12171122,11771128);the Fundamental Research Project of Shenzhen(No.JCYJ20190806143201649);Project(HIT.NSRIF.2020056);the Natural Scientific。

摘　　要：Collocation and Galerkin methods in the discontinuous and globally continuous piecewise polynomial spaces,in short,denoted as DC,CC,DG and CG methods respectively,are employed to solve second-kind Volterra integral equations(VIEs).It is proved that the quadrature DG and CG(QDG and QCG)methods obtained from the DG and CG methods by approximating the inner products by suitable numerical quadrature formulas,are equivalent to the DC and CC methods,respectively.In addition,the fully discretised DG and CG(FDG and FCG)methods are equivalent to the corresponding fully discretised DC and CC(FDC and FCC)methods.The convergence theories are established for DG and CG methods,and their semi-discretised(QDG and QCG)and fully discretized(FDG and FCG)versions.In particular,it is proved that the CG method for second-kind VIEs possesses a similar convergence to the DG method for first-kind VIEs.Numerical examples illustrate the theoretical results.

关 键 词：Volterra integral equations collocation methods Galerkin methods discontinuous Galerkin methods convergence analysis 

分 类 号：O175[理学—数学]