TY  - JOUR 
AU  - Marriaga, Misael E.
AU  - Pérez Fernández, Teresa Encarnación
AU  - Piñar González, Miguel Ángel
AU  - Recarte, Marlon J.
PY  - 2023
UR  - https://hdl.handle.net/10481/82258
AB  - In this work, we deal in a d dimensional unit ball equipped with an inner product
constructed by adding a mass point at zero to the classical ball inner product applied to
the gradients of the functions. Apart from determining an explicit orthogonal...
LA  - eng
PB  - Elsevier
KW  - Approximation on the ball
KW  - Inner product via gradient
KW  - Fourier expansions
TI  - Approximation via gradients on the ball. The Zernike case
DO  - 10.1016/j.cam.2023.115258
ER  -