The majority likely comes from <physics>:
* <heat equation>
* <wave equation>
* <Maxwell's equations>
* <Schrödinger equation>
* <Navier-Stokes equations>


Important partial differential equation

In many important applications, what you have to solve is not just a single <partial differential equation>, but multiple partial differential equations coupled to each other. This is the case for many key PDEs including:
* <Maxwell's equations>, see: <explicit scalar form of the Maxwell's equations>{full}
* <Navier-Stokes equations>
* <Schrödinger equation>, see: <why are complex numbers used in the Schrodinger equation?>{full}


Ciro Santilli @cirosantilli 34

 Incoming links: Navier-Stokes equations