Rewriting an equation to include a condition I have a simple equation: a = b(c/d)

but it has a condition: if b > 1, then b = 1

How do I write this condition into the equation?
$$a=\min(b,1)\cdot(c/d){}{}{}$$
Your question is really not a physics question, but a mathematical one. However, the way to add in the condition is the following:

$$
a = \begin{cases}\left(\frac{c}{d}\right) &amp; {\rm if}\,b&gt;1 \\ b\left(\frac{c}{d}\right) &amp; {\rm otherwise}\end{cases}
$$

The long brace is the cases environment in latex: $\begin{cases} ...stuff...\end{cases}$