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- His last publication, which appeared in 1878, was on spherical
**harmonics**(Beitreige zur Theorie der Kugelf unctionen) . - Love has shown that the great features of the relief of the lithosphere may be expressed by spherical
**harmonics**of the first, second and third degrees, and their formation related to gravitational action in a sphere of unequal density.' - For the subjects of this heading see the articles DIFFERENTIAL EQUATIONS; FOURIER'S SERIES; CONTINUED FRACTIONS; FUNCTION; FUNCTION OF REAL VARIABLES; FUNCTION COMPLEX; GROUPS, THEORY OF; INFINITESIMAL CALCULUS; MAXIMA AND MINIMA; SERIES; SPHERICAL
**HARMONICS**; TRIGONOMETRY; VARIATIONS, CALCULUS OF. - He further treated in a masterly manner of echoes and the mixture of sounds, and explained the phenomenon of grave
**harmonics**as due to the occurrence of beats so rapid as to generate a musical note. - The expressions designated by Dr Whewell, Laplace's coefficients (see Spherical
**Harmonics**) were definitely introduced in the memoir of 1785 on attractions above referred to.