How do I post in latex the subtext under some formulas.

For example

http://www.m-hikari.com/ija/forth/dr...JA5-8-2009.pdf

Go to page 233 of this document and there are formulas with

"max" for example, and under the "max" there is subtext.

Just look at the norm and you see that there are conditions under the "max" to the effect of .

How do I put this under the ?

regards

Bucephalus