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What is the way to change the way the align environment numbers the equations? enter image description here

Say I want to change the (1) to a (I) or a (A)

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    That is not really something align does, but all the eqn giving envs. Is it only this particular one or do you want all eqn numbers like that? And BTW welcome
    – daleif
    Sep 17, 2016 at 18:05
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    Related: How do I number equations with roman numbers?
    – Werner
    Sep 17, 2016 at 18:21
  • Really I was just looking to change one particular one, but the answer given helped. And thanks btw.
    – D. Brito
    Sep 17, 2016 at 22:22

1 Answer 1

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You can use the \newtagform and \usetagform from mathtools. Here are a few samples:

\documentclass[leqno]{article}
\usepackage[utf8]{inputenc}
\usepackage{fourier, erewhon}
\usepackage{mathtools}

\newtagform{Alph}[\renewcommand{\theequation}{\Alph{equation}}]()
\newtagform{roman}[\renewcommand{\theequation}{\roman{equation}}]()
\newtagform{scroman}[\renewcommand{\theequation}{\scshape\roman{equation}}][]

\begin{document}

\usetagform{Alph}
\begin{equation} 
a = b + c 
\end{equation}
\usetagform{roman}
\begin{equation}
d = e + f
\end{equation}

\usetagform{default}
\begin{equation}
x = y + z
\end{equation}

\usetagform{scroman}
\begin{equation}
u = v + w
\end{equation}

\end{document} 

enter image description here

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