The package defines variants \mleft and \mright of \left and \right, that make the delimiters act as \mathopen and \mathclose. These commands address spacing difficulties in subformulas.
The author is Heiko Oberdiek. The package is Copyright © 2010 Heiko Oberdiek.
License: lppl1.3 Version: 1.0 Catalogued: 2014-02-26