\substack - Tex Command

substack

\substack - Used to create multi-line subscripts or superscripts.

SYNOPSIS

{ \substack}

DESCRIPTION

\substack command draws multi-line subscripts or superscripts.

EXAMPLE

1. \sum_{
   \substack{
   1\lt i\lt 3 \\
   1\le j\lt 5
   }}
   a_{ij}
   

   $ \sum_{ \substack{ 1\lt i\lt 3 \\ 1\le j\lt 5 }} a_{ij} $

2. ^{\substack{\text{a very} \\
   \text{contrived} \\
   \text{example}
   }}
   {\frac ab}_{\substack{
   \text{isn't} \\
   \text{it?}
   }}
   

   $ ^{\substack{\text{a very} \\ \text{contrived} \\ \text{example} }} {\frac ab}_{\substack{ \text{isn't} \\ \text{it?} }} $