Another term for del.
- He used what he called the ‘fluxio-differential’ method, so called because it used two independent first-order Leibniz type differential operators.
- In these papers a special role is played by expansions in terms of the eigenfunctions of linear differential operators.
- He showed how to extend Laplace's series to give a perturbing function in the case of elliptical orbits by introducing differential operators which act on the Laplace coefficients.
Definition of differential operator in:
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