TikZ-cd Diagrams Side-by-Side

Question

I have two diagrams – drawn in TikZ-cd – which I'd like to have side-by-side. However, even though I haven't left a blank line between the code for the two diagrams, they still appear above/below one another.

Here's a MWE:

\documentclass[12pt]{article}
\usepackage[margin=20mm]{geometry} %changes margins
\usepackage{mathrsfs} % fancy maths latters
\usepackage{amsmath} %improves equation environment
\usepackage{tikz-cd} %diagrams
\usepackage{subcaption} %side by side diagrams
\usepackage{caption} %customises captions
\title{Side-by-Side Diagrams MWE}
\begin{document}
\maketitle
Here are two diagrams that I would like to have side-by-side:
\begin{figure}[h!]
    \centering
    \begin{tikzcd}[column sep=small]
    \mathscr{L}{1} &  & \mathscr{L}{2}\
    & p_{1} \arrow[lu] \arrow[ru] &\
    & \text{Argument} \arrow[u] &\
    \end{tikzcd} \caption{Many-one pluralism.}
    \begin{tikzcd}[column sep=small]
    \mathscr{L}{1} &  & \mathscr{L}{2}\
    p_{1} \arrow[u] &  & p_{2} \arrow[u]\
    & \text{Argument} \arrow[lu] \arrow[ru] &\
    \end{tikzcd} \caption{One-many pluralism.}
\end{figure}
\end{document}

Which outputs:

I've also tried using mini-pages, sub-floats (e.g. Two diagrams side by side), and the subcaption package (e.g. Placing TikZ drawings in a minipage side by side) to solve the problem, but in each case I get loads of errors... (Maybe these packages are compatible with TikZ but not TikZ-cd?) Thanks for your help!

Answer 1

You can have it with floatrow, if you enable the replacement of & with \&:

\documentclass[12pt]{article}
\usepackage[margin=20mm]{geometry} %changes margins
\usepackage{mathrsfs} % fancy maths latters
\usepackage{amsmath} %improves equation environment
\usepackage{tikz-cd} %diagrams
\usepackage{subcaption} %side by side diagrams
\usepackage{caption} %customises captions
\usepackage{floatrow}
\title{Side-by-Side Diagrams MWE}
\author{I. Ego}
\begin{document}
\maketitle
Here are two diagrams that I would like to have side-by-side:
\begin{figure}[h!]
    \tikzset{column sep=small, ampersand replacement=&}
\begin{floatrow}
    \centering
    \ffigbox{\begin{tikzcd}
    \mathscr{L}{1} & & \mathscr{L}{2}\
    & p_{1} \arrow[lu] \arrow[ru] &\
    & \text{Argument} \arrow[u] &\
    \end{tikzcd}}{\caption{Many-one pluralism.}}
    \ffigbox{\begin{tikzcd}
    \mathscr{L}{1}& & \mathscr{L}{2}\
    p_{1} \arrow[u] & & p_{2} \arrow[u]\
    & \text{Argument} \arrow[lu] \arrow[ru] &\
    \end{tikzcd}}{\caption{One-many pluralism.}}
    \end{floatrow}
\end{figure}
\end{document}