1

This working example:

\documentclass[a4paper]{report}

\usepackage{mleftright}
\usepackage{braket}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{mathrsfs}

\newcommand{\diff}{\mathop{}\!\mathrm{d}}

\begin{document}

they are related by Fourier transformation:
\begin{subequations}
\begin{subequations}
\label{Position-MomentumSpaceWaveFunctionsDiscr}
\begin{align}
    \psi \mleft( x \mright) = \braket{x \vert \psi} = \braket{x \vert \hat{\mathbb{I}} \vert \psi} & = \braket{x \vert \mleft( \sum_{p' \in \mathscr{P}} \ket{p'} \bra{p'} \mright) \vert \psi} \notag \\
    & = \sum_{p' \in \mathscr{P}} \braket { x \vert p' } \braket{ p' \vert \psi } = \sum_{p' \in \mathscr{P}} \braket { x \vert p' } \phi \mleft( p' \mright) \, , \label{PositionSpaceWaveFunctionsDiscr} \\
    \phi \mleft( p \mright) = \braket{p \vert \psi} = \braket{p \vert \hat{\mathbb{I}} \vert \psi} & = \braket{p \vert \mleft( \sum_{x' \in \mathscr{X}} \ket{x'} \bra{x'} \mright) \vert \psi} \notag \\
    & = \sum_{x' \in \mathscr{X}} \braket { p \vert x' } \braket{ x' \vert \psi } = \sum_{x' \in \mathscr{X}} \braket { p \vert x' } \psi \mleft( x' \mright) \label{MomentumSpaceWaveFunctionsDiscr}
\end{align}
\end{subequations}
or
\begin{subequations}
\label{Position-MomentumSpaceWaveFunctionsCont}
\begin{align}
    \psi \mleft( x \mright) = \braket{x \vert \psi} = \braket{x \vert \hat{\mathbb{I}} \vert \psi} & = \braket{x \vert \mleft( \int\limits_{\mathscr{P}} \! \diff p' \, \ket{p'} \bra{p'} \mright) \vert \psi} \notag \\
    & = \int\limits_{\mathscr{P}}\! \diff p' \, \braket { x \vert p' } \braket{ p' \vert \psi } = \int\limits_{\mathscr{P}}\! \diff p' \, \braket { x \vert p' } \phi \mleft( p' \mright) \, , \label{PositionSpaceWaveFunctionsCont} \\
    \phi \mleft( p \mright) = \braket{p \vert \psi} = \braket{p \vert \hat{\mathbb{I}} \vert \psi} & = \braket{p \vert \mleft( \int\limits_{\mathscr{X}} \! \diff x' \, \ket{x'} \bra{x'} \mright) \vert \psi} \notag \\
    & = \int\limits_{\mathscr{X}}\! \diff x' \, \braket { p \vert x' } \braket{ x' \vert \psi } = \int\limits_{\mathscr{X}}\! \diff x' \, \braket { p \vert x' } \psi \mleft( x' \mright) \, , \label{MomentumSpaceWaveFunctionsCont}
\end{align}
\end{subequations}
\end{subequations}
respectively, with $ \braket{p' \vert x'} = \braket{x' \vert p'}^* $ as outlined in \eqref{InnerProduct} and $ \mathscr{X} $ and $ \mathscr{P} $ denoting the position and momentum eigenspectra. Orthonormality requires:
\newline
\begin{subequations}
\begin{minipage}[t]{0.5\textwidth}
    \begin{equation}
    \label{OrthoNormPositionKetsDiscr}
         \text{and }\braket{x_{1} \vert x} = \delta_{x_{1},x}
    \end{equation}
\end{minipage}
\begin{minipage}[t]{0.5\textwidth}
    \begin{equation}
    \label{OrthoNormPositionKetsCont}
        \braket{x_{1} \vert x} = \delta(x_{1}-x)
    \end{equation}
\end{minipage}\hfill
\end{subequations}
\newline
\newline
\newline
for position kets and also momentum eigenkets:

\end{document}

produces the following output: enter image description here

whereas naturally the numbering should continue at 2.

In my actual document, the nested subequations are 1.30aa, 1.30ab, 1.30ba, and 1.30bb, respectively and the numbering 'resets' to 1.3a & 1.3b in the following subequations in one line.

How to fix this?

  • it isn't supported and it seems a bit strange. you could use \tag and label by hand to just use normal equations and locally specify the equation counter formatting to get what you need – David Carlisle Jun 1 at 15:53
1

Each subequations increment counter equations. Since you nested them, on the end the counter equation is increment twice. This you cen solve with addint \addtocounter{equation}{-1} ˙after end of outersubequations`:

\documentclass[a4paper]{report}

\usepackage{mleftright}
\usepackage{braket}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{mathrsfs}

\newcommand{\diff}{\mathop{}\!\mathrm{d}}

\begin{document}

they are related by Fourier transformation:
\begin{subequations}
\begin{subequations}\label{Position-MomentumSpaceWaveFunctionsDiscr}
\begin{align}
\psi \mleft( x \mright) = \braket{x \vert \psi} = \braket{x \vert \hat{\mathbb{I}} \vert \psi} 
    & = \braket{x \vert \mleft( \sum_{p' \in \mathscr{P}} \ket{p'} \bra{p'} \mright) \vert \psi} \notag \\
    & = \sum_{p' \in \mathscr{P}} \braket { x \vert p' } \braket{ p' \vert \psi } = \sum_{p' \in \mathscr{P}} \braket { x \vert p' } \phi \mleft( p' \mright) \, , \label{PositionSpaceWaveFunctionsDiscr} \\
\phi \mleft( p \mright) = \braket{p \vert \psi} = \braket{p \vert \hat{\mathbb{I}} \vert \psi} 
    & = \braket{p \vert \mleft( \sum_{x' \in \mathscr{X}} \ket{x'} \bra{x'} \mright) \vert \psi} \notag \\
    & = \sum_{x' \in \mathscr{X}} \braket { p \vert x' } \braket{ x' \vert \psi } = \sum_{x' \in \mathscr{X}} \braket { p \vert x' } \psi \mleft( x' \mright) \label{MomentumSpaceWaveFunctionsDiscr}
\end{align}
\end{subequations}
or
\begin{subequations}
\label{Position-MomentumSpaceWaveFunctionsCont}
\begin{align}
    \psi \mleft( x \mright) = \braket{x \vert \psi} = \braket{x \vert \hat{\mathbb{I}} \vert \psi} & = \braket{x \vert \mleft( \int\limits_{\mathscr{P}} \! \diff p' \, \ket{p'} \bra{p'} \mright) \vert \psi} \notag \\
    & = \int\limits_{\mathscr{P}}\! \diff p' \, \braket { x \vert p' } \braket{ p' \vert \psi } = \int\limits_{\mathscr{P}}\! \diff p' \, \braket { x \vert p' } \phi \mleft( p' \mright) \, , \label{PositionSpaceWaveFunctionsCont} \\
    \phi \mleft( p \mright) = \braket{p \vert \psi} = \braket{p \vert \hat{\mathbb{I}} \vert \psi} & = \braket{p \vert \mleft( \int\limits_{\mathscr{X}} \! \diff x' \, \ket{x'} \bra{x'} \mright) \vert \psi} \notag \\
    & = \int\limits_{\mathscr{X}}\! \diff x' \, \braket { p \vert x' } \braket{ x' \vert \psi } = \int\limits_{\mathscr{X}}\! \diff x' \, \braket { p \vert x' } \psi \mleft( x' \mright) \, , \label{MomentumSpaceWaveFunctionsCont}
\end{align}
\end{subequations}
\end{subequations}
\addtocounter{equation}{-1} % <---
respectively, with $ \braket{p' \vert x'} = \braket{x' \vert p'}^* $ as outlined in \eqref{InnerProduct} and $ \mathscr{X} $ and $ \mathscr{P} $ denoting the position and momentum eigenspectra. Orthonormality requires:
\newline
\begin{subequations}
\begin{minipage}[t]{0.5\textwidth}
    \begin{equation}
    \label{OrthoNormPositionKetsDiscr}
         \text{and }\braket{x_{1} \vert x} = \delta_{x_{1},x}
    \end{equation}
\end{minipage}%
\begin{minipage}[t]{0.5\textwidth}
    \begin{equation}
    \label{OrthoNormPositionKetsCont}
        \braket{x_{1} \vert x} = \delta(x_{1}-x)
    \end{equation}
\end{minipage}
\end{subequations}
\newline
\newline
\newline
for position kets and also momentum eigenkets:

\end{document}

enter image description here

| improve this answer | |
  • ok. In my overall document I have to add +28 and obviously adjust, if the count before changes. And the \newlines are actually also necessary - else it messes up the formatting – Markus Gratis Jun 1 at 16:04
  • 1
    @MarkusGratis, I focused only on numbering problem. Formatting of your document I left to you (now I see that I accidentally remove \newline before mini pages). – Zarko Jun 1 at 16:18
  • no worries :) thanks for helping – Markus Gratis Jun 1 at 16:22

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