In the case of a repulsive force varying as the distance from the origin, the equation of motion is of the type the solution of which is x=Ae+Be, (10)
He grew up among enemies, and became artful, suspicious and self-controlled, concealing his feeling behind the mask of an immobile, almost repulsive, coldness.
Grotesque and repulsive wooden figures, animals and the bones of chiefs were the objects of worship. Human sacrifices were offered whenever a temple was to be dedicated, or a chief was sick, or a war was to be undertaken; and these occasions were frequent.
Perhaps to the student there is no part of elementary mathematics so repulsive as is spherical trigonometry.