(fluid dynamics) A physical law that gives the pressure drop in an incompressible Newtonian fluid in laminar flow flowing through a long cylindrical pipe of constant cross section.

Synonym of Pell's equation

plural of Pell-Fermat equation

(military) A line drawn on a map or chart connecting all points at which the magnetic inclination (dip) is zero for a specified epoch.

(astronomy) A great circle on the celestial sphere, coincident with the plane of earth's equator.

plural of celestial equator

plural of magnetic equator

the equation ̂H𝜓(⃑r)=E𝜓(⃑r), for some constant E; applies to separable solutions 𝛹(⃑r,t)=𝜓(⃑r)𝜙(t) to the Schrödinger equation

Resembling or characteristic of an equation.

In terms of equations.