Commands: xrightarrow, xleftarrow, substack, underset, dddot
over/under arrows (e.g. underleftarrow).
Environments: align, alignat, xalignat, xxalignat, multline, gather
Commands: xrightarrow, xleftarrow, substack, underset, dddot
over/under arrows (e.g. underleftarrow).
Environments: align, alignat, xalignat, xxalignat, multline, gather