This question is often best answered by example. Imagine a styrofoam cup with a hole in the bottom. If I then pour honey into the cup I will find that the cup drains very slowly. That is because honey ...

Fluid dynamics is the branch of physics concerning fluid flow. It is distinguishable from other disciplines in fluid mechanics as it deals with fluids in motion. In physics, a fluid is a substance ...

In this short note we suggest a refinement for the definition of viscosity solutions for parabolic equations. The new version of the definition is equivalent to the usual one and it better adapts to ...