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4

As already suggested by @barbarabeeton, you could use an aligned environment inside an equation environment. An additional suggestion: To obtain a bit more horizontal separation between the two groups of three equations, insert \qquad\qquad right before the middle & alignment marker in the first row. \documentclass{article} \usepackage{amsmath} % for '...

4

You can use the \numberwithin command from amsmath to number the equation counter within the enumi counter, which is the counter from the items in the enumerate environment. For example, \documentclass{article} \usepackage{amsmath} \usepackage{enumitem} \numberwithin{equation}{enumi} \begin{document} \begin{enumerate}[label={\bfseries\arabic*.}, ref=\arabic*...

4

You could just redefine the lemma counter. \documentclass{svjour3} \counterwithin{lemma}{theorem} \begin{document} \begin{theorem} A theorem \end{theorem} \begin{lemma} A lemma \end{lemma} \begin{lemma} Another lemma \end{lemma} \begin{theorem} A theorem \end{theorem} \begin{lemma} A lemma \end{lemma} \begin{lemma} Another lemma \end{lemma} \end{...

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2

To build a numbered tcolorbox you should use a \newtcbolorbox command instead of a \newenvironment. This way you can use a counter within every tcolorbox. Take a look at section "5 Initialization Option Keys" in tcolorbox documentation. Here you have an example with mybox: \documentclass{article} \usepackage[most]{tcolorbox} \newtcolorbox[auto counter, ...

2

Maybe something of this kind, but the brace and the main equation number are unnecessary, in my opinion. \documentclass{article} \usepackage{amsmath} \usepackage{hyperref} \usepackage{lipsum} % for mock text \begin{document} \lipsum[2] \begin{subequations}\label{main} \left. \addtocounter{equation}{-1} \edef\theHparentequation{x.\...

1

Except for itemize not being numbered, everything worked fine. No packages needed. \documentclass{article} \makeatletter \@addtoreset{equation}{enumi} \makeatother \renewcommand{\theequation}{\theenumi.\arabic{equation}} \begin{document} \begin{enumerate} \item test $$x=a$$ $$x=b$$ \item test \begin{...

1

You only need the command \includegraphics to insert figures. The figure environment will only count the number of "figures" if there is a \caption inside it. The following example shows the concept and some variations you might use. \documentclass{article} \usepackage{graphicx} \usepackage{float} \begin{document} \includegraphics[width=0.2\linewidth]{...

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1

The command \chaptername from the titlesec package can be used for that. As an example, the third chapter is produced with the following code. \documentclass{book} \usepackage{titlesec} \renewcommand{\chaptername}{Story} \begin{document} \chapter{} \chapter{} \chapter{Case Study} \end{document}

1

Here's a solution using amsthm's environments, but defining other environments from them to adjust the counters when problems and answers are called. \documentclass{article} \usepackage{amsmath,amsthm} \theoremstyle{definition} \newtheorem{prob}{Problem} \newtheorem{ans}{Answer} \numberwithin{prob}{section} \numberwithin{ans}{section} \newenvironment{...

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1

This answer really belongs to @Bernard. The chapter number can be added to the output theorem counter without forcing the chapter number to appear as part of the section number by this redefinition: \renewcommand{\thetheorem}{\thechapter.\thesection.\arabic{theorem}}

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