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gr-qc2021
Multipole moment and singular source in Newtonian gravity and in Einstein gravity
Yu-Zhu Chen, Yu-Jie Chen, Shi-Lin Li +1
The multipole moments are defined as the multipole expansion coefficients of the gravitational field at infinity. In Newtonian gravity, the multipole moments are determined by the…
math.GM2021
Eliminating oscillation in partial sum approximation of periodic function
Shi-Lin Li, Yuan-Yuan Liu, Wen-Du Li +1
If we cannot obtain all terms of a series, or if we cannot sum up a series, we have to turn to the partial sum approximation which approximate a function by the first several terms…