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To change, as an algebraic expression or geometrical figure, into another from without altering its value.

id of a curve when the coördinates of the point on the curve can be expressed as rational algebraic functions of a single parameter th.

e of virtual velocities (Mech.), the law that when several forces are in equilibrium, the algebraic sum of their virtual moments is equal to zero. -- Virtual focus (Opt.), the point from which rays, having been rendered divergent by reflection of refraction, appear to issue; the point at which converging rays would me…

A branch of algebra which relates to the direct search for unknown quantities. [R.]