[¦hī·pǝr¦bäl·ik ´dif·ǝ¦ren·chǝl i`kwā·zhǝn]
MATHEMATICS A general type of second- order partial differential equation which includes the wave equation and has the form
where the Aij , Bi , C, and F are suitably differentiable real functions of x1, x2, . . ., xn , and there exists at each point (x1, x2, . . ., xn ) a real linear transformation on the xi which reduces the quadratic form
to a sum of n squares not all of the same sign.
- thermodynamics
- thermodynamic system
- thermodynamic temperature scale
- thermodynamic variable
- thermoelasticity
- thermoelectric converter
- thermoelectric cooler
- thermoelectric cooling
- thermoelectric diffusion potential
- thermoelectric effect
- thermoelectric engine
- thermoelectric generator
- thermoelectric heating
- thermoelectricity
- thermoelectric junction
- thermoelectric laws
- thermoelectric material
- thermoelectric nuclear battery
- thermoelectric power generator
- thermoelectric properties
- thermoelectric pyrometer
- thermoelectric refrigeration
- thermoelectric series
- thermoelectric solar cell
- thermoelectric thermometer