An arrangement of bevel gears permitting the rotation of two shafts at two different speeds whilst supplying the same torque; used on the drive axles or between the driven wheels of automobiles to aid cornering.

(calculus) The calculus that deals with instantaneous rates of change.

(medicine) The process of determining which disease, from a set of possible candidates, is causing a patient's symptoms.

(calculus) an equation involving the derivatives of a function

plural of differential geometry

A branch of psychology focusing on how and why individuals differ in their behaviour.

(mathematics, mathematical analysis) An operator defined as a function of the differentiation operator (the operator which maps functions to their derivatives).

plural of differential operator

(automotive, mechanical engineering) Steering by means of driving the wheels or treads on one side of a vehicle faster than those on the other side, or driving the wheels or treads on one side in the forward and on the other side in the reverse direction.

(mathematics) an infinitesimal change in a variable in a partial derivative, or the result of partial differentiation