eq­nar­ray – More gen­er­alised equa­tion ar­rays with num­ber­ing

De­fines an equa­tion­ar­ray en­vi­ron­ment, that al­lows more than three columns, but oth­er­wise be­haves like LaTeX's eq­nar­ray en­vi­ron­ment. This en­vi­ron­ment is sim­i­lar, in some ways, to the align en­vi­ron­ment of ams­math.
The pack­age re­quires the ar­ray pack­age.