https://educapes.capes.gov.br/handle/capes/469372?mode=full
Portal eduCapes: Approximation of Discontinuous Functions by Fourier Series
discontinuous functionsportalapproximationfourierseries
https://repository.kpi.kharkov.ua/entities/publication/ff1a26d5-08c3-4b74-b2bc-331bcddb361f
Construction of discontinuous interlineation polynomial splines for functions of two variables
The article suggests a general method for constructing discontinuous interlineation polynomial splines, which, as a partial case, include discontinuous and...
constructionpolynomialsplinesfunctionstwo