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EDIT: There was a pst suggested in the comments, but I have gone through it and tried to understand how the answers relate to my typeset code. I am still at a loss for how what I have done is wrong.

I am looking for inline citations as 'author year' style, however they are coming up by the nickname. For instance, in my references list I have

 @article{main,
title = {Fraisse Limits, Ramsey Theory, and Topological Dynamics of Automorphism Groups},
author = {A.S. Kechris, V.G. Pestov, S. Todorcevic},
journal = {arXiv:math/0305241v4 [math.LO]},
year = {2004}
}

and when I write the following in overleaf:

Theorems from \cite{main} seen as essential to the main result are pretty much quoted verbatim.

It shows as

Theorems from [main] seen as essential to the main result are pretty much quoted verbatim.

rather than with author year. In fact, my references list is not exhibiting either.

I suspect it has to do with the warning I have just noticed next to my \printbibliography in my control file, which says 'warning, empty bibliography' when I however over it. Yet I have no idea why. My full control page is

\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{subfiles}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{a4wide}
\usepackage[english]{babel}
\usepackage{enumerate}
\usepackage[margin=1.2in]{geometry}
\usepackage[backend=biber, style=alphabetic]{biblatex}
%\usepackage[backend=biber, style=alphabetic, citestyle=authoryear]{biblatex}

\newtheorem{theorem}{Theorem}[section]
\newtheorem{corollary}{Corollary}[theorem]
\newtheorem{lemma}[theorem]{Lemma}
\theoremstyle{definition}
\newtheorem{definition}{Definition}[section]

\theoremstyle{remark}
\newtheorem*{remark}{Remark}


\addbibresource{ref.bib}

\title{\textbf{Meep}}



\begin{document}
\maketitle

\tableofcontents


\subfile{introduction.tex}
\subfile{f1.tex}
\subfile{f2.tex}
\subfile{AppendixA.tex}

\printbibliography

\end{document}
Meep
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    The input author = {A.S. Kechris, V.G. Pestov, S. Todorcevic}, is wrong. Multiple names must always be separated with and regardless of the desired output, so the correct input would be author = {A.S. Kechris and V.G. Pestov and S. Todorcevic},. (In this particular case the wrong input will not cause an error, but if you have other works with more than three authors that use the wrong input format, Biber may error and give up on your citations.) You may have to clear the Overleaf cache after you fix the error in the .bib file: https://de.overleaf.com/learn/how-to/Clearing_the_cache – moewe May 09 '20 at 12:12
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    Unrelated to the actual problem, but I wouldn't use @article for a paper that was only published on the arXiv: Use @online and move the arXiv identifier from the journal field to eprint and eprinttype: eprinttype = {arxiv}, eprint = {math/0305241v4}, eprintclass = {math.LO}, See also https://tex.stackexchange.com/q/415115/35864. – moewe May 09 '20 at 12:17
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    Question mark or bold citation key instead of citation number might be helpful. – leandriis May 09 '20 at 12:32
  • @leandriis I have gone through the suggested post, but am still struggling to figure out concretely how to fix the issue. The answers help me to understand how the process occurs heuristically, but I still do not see what the error is in what I have written – Meep May 09 '20 at 14:21
  • After having corrected the errors moewe pointed out in a previous comment, did you run biber on your .tex file? – leandriis May 09 '20 at 14:23
  • @leandriis At the top I have \usepackage[backend=biber, style=alphabetic]{biblatex} which I thought runs biber – Meep May 09 '20 at 14:24
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    Have you corrected the wrong author field? On Overleaf Biber will run automatically for you. (You may have to clear the cache to avoid errors.) – moewe May 09 '20 at 14:25
  • Overleaf may run biber for you, but on a local installation you have to press a special button. Please take a look at https://en.m.wikibooks.org/wiki/LaTeX/Bibliographies_with_biblatex_and_biber – Johannes_B May 09 '20 at 15:05

1 Answers1

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Some comments and observations (some of which have already been made in earlier comments):

  • If you want authoryear-style citation callouts, don't specify style=alphabetic while loading biblatex. Instead, use either style=authoryear or some style (e.g., apa and apa6) that generates authoryear-style citation callouts.

  • Individual authors in the author field must be separated by the keyword and.

  • The entry type @article should be used exclusively for pieces published in scholarly academic journals. For your entry, use either the catch-all entry type @misc or the newer, biblatex-only entry type @online and replace journal = {arXiv:math/0305241v4 [math.LO]} with url = {https://arxiv.org/pdf/math/0305241.pdf}.

  • In the title field, do please replace Fraisse with either Fraïssé or -- if your keyboard setup doesn't allow the direct entry of the characters ï and é -- Fra{\"i}ss{\'e}.

  • Load the xurl package to facilitate the typesetting of URL strings in a way that allows problem-free line breaking.

  • Last but not least, don't forget to run biber after adding or changing \cite-type instructions.

enter image description here

\documentclass[12pt]{article}
\begin{filecontents}[overwrite]{ref.bib}
@online{kpt:04,
title  = {Fraïssé Limits, {Ramsey} Theory, and 
          Topological Dynamics of Automorphism Groups},
author = {A. S. Kechris and V. G. Pestov and S. Todorcevic},
url    = {https://arxiv.org/pdf/math/0305241.pdf},
year   = 2004
}
\end{filecontents}
\usepackage{geometry}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{xurl}
\usepackage[backend=biber, style=authoryear, natbib]{biblatex}
\addbibresource{ref.bib}

\begin{document}
Theorems from \citet{kpt:04} seen as essential to the 
main result are pretty much quoted verbatim.
\printbibliography
\end{document}
Mico
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