\quad to align the condition.a+b=c, \quad a>0,b\ge 0It looks like:
aligned environment.a+b=c,\quad \begin{aligned} a&>0,\\ b&\ge 0\end{aligned}It looks like:
版权声明：本文为博主原创文章，未经博主允许不得转载。
How to write conditional equations
原文：http://blog.csdn.net/stpallas/article/details/46802509