I'm trying to write a list of equations from a chapter of my textbook, each one preceded by a \label{} command so that I can refer to it in the rest of the text.
However after the 1st \begin{align} \end{align} environment, I've inserted a \begin{subequations} environment, then another \begin{align} environment. This has resulted in 3 blocks of equations that are aligned each in their own way. I want them to align all as the 1st block of equations. Is there a way to do that?
I'm using the scrartcl class, a number of packages that I've listed below and some \newcommand to speed up the typing. I'm running TeXLive 2013 on Win7 with TeXStudio 2.6.6.
\documentclass[a4paper, 12pt]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage[italian]{babel}
\usepackage{hyperref}
\hypersetup{pdfstartview=FitH}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{mathrsfs}
\usepackage{amssymb}
\usepackage{booktabs}
\usepackage{graphicx}
\usepackage{tabularx}
\usepackage{caption}
\usepackage{mathrsfs}
\usepackage{marvosym}
\usepackage{textcomp}
\usepackage{enumerate}
\usepackage{siunitx}
\usepackage{outlines}
\usepackage{cancel}
\usepackage[italian]{cleveref} % \cref adds ``fig.'' or ``eq.'' before the reference
\graphicspath{{./pictures/}} %{./figuresdir2/}{./figuresdir3/}}
\renewcommand{\@}{\MVAt}
%\renewcommand{\familydefault}{\sfdefault} %uses sans-serif font for entire document
\newcommand{\domanda}[1]{\paragraph{Q: #1\newline}}
\newcommand{\es}{\varepsilon_s}
\newcommand{\Nd}{N\ped{d}}
\newcommand{\Na}{N\ped{a}}
\newcommand{\xd}{$x\ped{d}$}
\newcommand{\Ld}{$L\ped{D}$}
\newcommand{\Oi}{$\phi_i$}
\newcommand{\campoE}{\mathscr{E}\ped{x}}
\newcommand{\wf}{$q\Phi$}
\newcommand{\WF}[1]{\Phi_\text{#1}}
\newcommand{\derivata}[2]{\frac{\textup{d}{#1}}{\textup{d}{#2}} }
\newcommand{\derivataseconda}[2]{\frac{\textup{d}^2{#1}}{\textup{d}{#2}^2} }
\newcommand{\derivataparziale}[2]{\dfrac{\partial{#1}}{\partial {#2}} }
\newcommand{\integrale}[4]{\displaystyle \int_{#3}^{#4}#1\,\text{d}{#2} }
\DeclareMathOperator\erf{erf}
\DeclareMathOperator\erfc{erfc}
\newcommand{\email}[1]{\href{mailto:#1}{{\small\texttt{#1}}}}
%----------------------------------
\title{E.S.S.}
\author{}
\date{}
\begin{document}
\maketitle
\tableofcontents
\thispagestyle{empty}
\clearpage
\include{cap7}
\include{cap7_formule}
\end{document}
This is the cap7_formule.tex file, containing the said 3 blocks of equations that I can't get aligned uniformly:
\section{Formule cap.7}
\begin{align}
\label{7.1.1} I\ped{c} &=\dfrac{q\tilde{D\ped{n}} n\ped{i}^{2} A\ped{E} \, \exp({qV\ped{BE}/kT})}{\integrale{p}{x}{0}{x_B} } & \\
\label{7.1.2} \derivataparziale{I_C}{V\ped{CB}}&= \dfrac{-q\tilde{D\ped{n}} n\ped{i}^{2} A\ped{E} \, \exp({qV\ped{BE}/kT}) \, p(x_B) }{\bigg[\integrale{p}{x}{0}{x_B} \bigg]^{2}} \, \derivataparziale{x_B}{V\ped{CB}}&\\
\label{7.1.3} \notag \derivataparziale{I\ped{C}}{V\ped{CB}}&= -I\ped{C}\,p(x\ped{B}) \Bigg[ \dfrac{1}{\integrale{p}{x}{0}{x\ped{B}}} \Bigg] \, \bigg [\derivataparziale{x\ped{B}}{V\ped{CB}} \bigg] &\\
&= {} -\dfrac{I\ped{C}}{V\ped{A}}=\dfrac{I_C}{|V_A|}\\
\label{7.1.4} V\ped{A}&= \dfrac{\integrale{p}{x}{0}{x_B} }{p(x\ped{B}) \derivataparziale{x\ped{B}}{V\ped{CB}}}
\end{align}
\begin{subequations}
Scrivo V\ped{A}, la tensione di Early, in modo pratico:
\label{eqn:alternativeVa}
\begin{align}
\label{7.1.5} \integrale{p}{x}{0}{x\ped{B}}&=\dfrac{Q\ped{B}}{q}\\
\label{7.1.6} q\, p(x\ped{B}) \, \derivata{x_B}{V\ped{CB}}&=\derivata{Q_B}{V\ped{CB}}\\
\label{7.1.7} \bigg| \derivata{Q_B}{V\ped{CB}} \bigg|&= C\ped{jc}\\
\label{7.1.8} |V\ped{A}|&= \dfrac{Q\ped{B}}{C\ped{jC}}
\end{align}
\end{subequations}
\begin{align}
\label{7.2.1}I_B&= I_0\, \exp\big( {\dfrac{qV\ped{BE}}{nkT}} \big)\\
\label{7.2.2} \integrale{p(x)}{x}{0}{x\ped{B}}&=\integrale{[N\ped{a}(x) + \, n'(x)]}{x}{0}{x\ped{B}}\\
\label{7.2.3} n(0) &=\dfrac{N\ped{a}(0)}{2} \bigg[ \bigg(1+ \dfrac{4 \, n^{2}\ped{i} \, \exp(qV\ped{BE}/kT)}{N\ped{a}(0)} \bigg)^{1/ \,2} -1 \bigg]\\
\label{7.2.4} \derivata{\campoE}{x}&=\dfrac{1}{\varepsilon\ped{s}}\bigg( q\,N(x) - \dfrac{J_C}{v(x)} \bigg)\\
\label{7.2.5} V\ped{CB}+\phi \ped{i}&=\integrale{-\campoE}{x}{x_B}{x_C}
\end{align}
Here is what I get in the pdf:
