An equation with brackets must be expanded before it is solved. An understanding of expanding brackets is essential when solving equations with brackets. Some equations include a set of brackets. When ...

Differential equations are fundamental tools in physics: they are used to describe phenomena ranging from fluid dynamics to general relativity. But when these equations become stiff (i.e. they involve ...

For the PDF version of this article, click here. Power electronic system designers know about natural convection, which starts with the simple statement: Hot air rises. For example, a power ...