# Using the HHA Class File

### Introduction

The hha class file hha.cls is a LaTeX class file designed to produce articles for Homology, Homotopy and Applications. Be sure to always use the latest version available from our website. Also, please follow the style guidelines.

### Using the class file

The file is used in a very similar way to the standard amsart article class, and automatically includes the amsmath features. It has some differences, mainly in an extended range of "front matter" commands to specify authors, addresses, received dates, and other such information.

A typical file may start something like the example shown below. You can also download this sample separately. All of the requested information must be filled in, except where noted.

\documentclass{hha}

% See http://intlpress.com/HHA/style/hhaguide.htm for more
% detailed instructions.

% Example:
%\usepackage{xy}

% Please do not include unused packages or macro definitions.

\begin{document}

% Title of document, usually lower case except for first word
% and proper nouns.  Avoid unnecessary symbols.
\title{Title of article}

% If the title is too long for the running head, use
% the following command to specify a short title:
%\shorttitle{Shorter title}

% First Author
\author{First Author}

\email{fauthor@some.domain}

% First author's postal address, with *line breaks* like below.  Do
% not use \\ to separate lines.  It will appear on one line in the
% article, but will be used exactly as typed below to send a
% complimentary copy of the journal, so ensure that it is a complete
% postal address with line breaks as would appear on an envelope.
%
% Also, if it is not obvious, please add a comment with % that says
% what part is a district within a city, what part is a city,
% what part is a region or province and what part is a postal code.
%
% We recommend using the most current address possible.
% If you want the journal copy sent to a different address than
% the one below, please let Dan Christensen  know.
Some University,
City, Region, Postal Code,
Country}

% If needed, use a \thanks command, but not inside the author command.
% \thanks{The first author was supported in part by a grant.}

% Second Author.
\author{Second Author}
\email{sauthor@some.domain}
% given above.  This one gives an example of an American address.
Other University,
Boston, MA 02139,
USA}

% Additional authors done in the same way.

% If the author names are too long for the running head, use
% the following command to specify a shorter version:
%\shortauthors{DOE, SMITH \andname\ WILLIAMS}

% AMS 2010 Mathematics Subject Classification.  List one or several,
% separated by commas, ending in a period.
% See http://www.ams.org/mathscinet/msc/msc2010.html for the 2010
% numbering system.
\classification{12X34, 55X78.}
% Use \classification[2000]{12X34, 55X78.} if you must use codes
% from the 2000 numbering system.

% Keywords of the article, usually singular, no leading caps.
% Separated by commas, ending with period.
\keywords{homology, homotopy.}

% Abstract comes before maketitle
\begin{abstract}
% Abstract text, usually no more than 200 words.
% Avoid bibliographic references (\cite) and complicated mathematics.
% Please do not use custom macros here, as this abstract has to
% be able to stand alone.  You may use standard tex/latex/AMS macros.
\end{abstract}

% Leave these items like this, and the journal will fill them in.
\revised{Month Day, Year}    % date of revision; omit, if no revision;
% if multiple revisions, separate by commas
\published{Month Day, Year}  % publish date
\submitted{Bill Murray}      % Name of Journal's Editor, who handled Article
\volumeyear{2014} % Volume Year
\issuenumber{2}   % Issue Number
\startpage{1}     % PageNumber of first page
\articlenumber{1} % Sequence number of article within issue
% If copyright is retained by author, comment this out:
\owner{International Press}

\maketitle

% Text of Document.  Use constructs such as \section, \subsection,
% \begin{theorem} ... \end{theorem}, \begin{proof} ... \end{proof}, etc.

\section{Introduction}

This is the introduction.  It contains a displayed equation:
$a + b = c .$

\begin{theorem}
A true statement.
\end{theorem}

\begin{proof}
This is the proof.
\end{proof}

\end{document}


### Front Matter

Standard article class uses one command, \author to specify all authors and all addresses. This makes specifying multiple authors inconvenient and so this class, in common with most other journal class files, abandons this in favour of having each author specified in separate \author commands.

\author{full name}
Each author is specified by such a command. The optional argument is for compatibility with classes that place author names in the running head. It is currently ignored by this class. (As it is intended for on screen viewing, it uses a `one sided' layout.)

Each author may optionally be followed by this command to specify an email address. This must come before the \address command.

After each group of authors sharing a postal address, this command should be used.

\thanks{footnote text}
First page footnote may be specified using \thanks. Note that unlike the article class, this command should not be used inside the arguments of the \author or \address commands. Also note that such first page footnotes have no footnote mark. The text of the footnote should make it clear what is being referred to.

\keywords{comma separated keyword list}
The author may specify keywords of the article, usually singular and lower case.

\classification{comma separated classification list}
The author should give AMS 2010 Mathematics Subject Classifications.

\begin{abstract}
\end{abstract}
Article abstract. Must be specified before \maketitle. Should stand alone. Please avoid bibliographical references, complicated tex constructs, etc.

### LaTeX versions

This class file should work with any release of the LaTeX version 2e.

This class file will not work with the previous version of LaTeX, (LaTeX 2.09). LaTeX 2.09 is not supported and should no longer be used.

### Misc.

The format is always single column 10pt, with a fixed page size.

The class redefines the \le and \leq commands to use the form that amssymb calls \leqslant. The original form is still available as \oldleq. (Similar changes for greater than or equals.)