mhequ – Mul­ti­col­umn equa­tions, tags, la­bels, sub-num­ber­ing

MHequ sim­pli­fies cre­at­ing multi-col­umn equa­tion en­vi­ron­ments, and tag­ging the equa­tions therein. It sup­ports sub-num­bers of blocks of equa­tions (like (1.2a), (1.2b), etc) and ref­er­ences to each equa­tion in­di­vid­u­ally (1.2a) or to the whole block (1.2). The la­bels can be shown in draft mode.
Com­ments in the pack­age it­self de­scribe us­age.