\documentclass{amsdtx}

\title{Differences between \amslatex/ version 1.1 and \amslatex/
version 1.2}
\author{American Mathematical Society\\Michael Downes}
\date{November 1994}

\begin{document}
\maketitle
\markboth{DIFFERENCES BETWEEN VERSIONS 1.1 AND 1.2}%
         {DIFFERENCES BETWEEN VERSIONS 1.1 AND 1.2}

In the following remarks, if a command is said to be \emph{deprecated},
it means that the command is considered obsolete, but it will continue
to work in compatibility mode; in most cases the command will work also
in native mode but with a warning at the first occurrence. Recall that
`compatibility mode' in \latex/ is put into effect if a document starts
with the old command \cn{documentstyle} instead of \cn{documentclass},
and `native mode' is used otherwise.

In version 1.2:
\begin{itemize}

\item Current \latex/ conventions are followed for font selection and
document class loading; for example,
to use the \pkg{amstex} package with a general document class such
as \cls{article}, you should no longer write
\begin{verbatim}
\documentstyle[amstex]{article}
\end{verbatim}
but write instead
\begin{verbatim}
\documentclass{article}
\usepackage{amstex}
\end{verbatim}

\item The old forms \cn{bf}, \cn{it}, etc., for the standard font
commands now behave as described in the first edition of the \latex/
book. Depending on the installation options used for your copy of
\amslatex/ version 1.1, this may be the `right' behavior for your
existing documents (that use \cn{documentstyle}); if not, you will need
to update the options list of the \cn{documentstyle} command by adding
\opt{newlfont}, for example:
\begin{verbatim}
\documentstyle[newlfont]{amsart}
\end{verbatim}

\item The command \cn{bold} is deprecated; use \cn{mathbf} instead, as
that is now the standard \latex/ command for bold in math formulas. See
also the remarks about math fonts in the \amslatex/ user's guide.
(Affects: \pkg{amstex}, \pkg{amsfonts}, \cls{amsart}, \cls{amsbook}.)

\item \cn{newsymbol} is deprecated; you can use \cn{DeclareMathSymbol}
instead (see the \latex/ font documentation in \fn{fntguide.tex} or in
\textit{The \latex/ Companion}).
(Affects: \pkg{amstex}, \pkg{amsfonts}, \cls{amsart}, \cls{amsbook}.)

\item \cn{frak}, \cn{Bbb} are deprecated; \cn{mathfrak}, \cn{mathBbb}
should be used instead.
(Affects: \pkg{amstex}, \pkg{amsfonts}, \cls{amsart}, \cls{amsbook}.)

\item \cn{rom} is deprecated; you can use \cn{textup} instead.
(Affects: \cls{amsart}, \cls{amsbook}.)

\item The old environments \env{pf}, \env{pf*} are superseded by a
single \env{proof} environment. It takes an optional argument to specify
an alternative heading text. This means existing documents that contain
a definition for a \cn{proof} command or a \env{proof} environment will
need adjustment; we regret the inconvenience, but believe that the new
approach will better serve everyone in the long run.
(Affects: \cls{amsart}, \cls{amsbook}.)

\item The following rarely used commands were moved out of the
\pkg{amstex} package into a separate package \pkg{amsxtra}:
\cn{fracwithdelims}, {accentedsymbol}, \cn{sphat}, \cn{spcheck},
\cn{sptilde}, \cn{spdot}, \cn{spddot}, \cn{spdddot}, \cn{spbreve},
\cn{@)))}, \cn{@(((}.
(Affects: \pkg{amstex}, \cls{amsart}, \cls{amsbook}.)

\item In the \cls{amsart} and \cls{amsbook} documentclasses, formerly
\cn{small} produced the same typesize as \cn{footnotesize} (8pt). Now
they produce different sizes, normally 9 and 8 respectively.
Furthermore, documentclass options \verb'8pt', \verb'9pt', \verb'11pt',
\verb'12pt' are now offered in addition to the default \verb'10pt'. Also
the range of typesize-changing commands is filled out to include, below
\cn{normalsize}, the following: \cn{small}, \cn{Small}, \cn{SMALL},
\cn{tiny}, \cn{Tiny}. \cn{footnotesize} and \cn{scriptsize} are retained
as synonyms of \cn{Small} and \cn{SMALL} respectively. As it stands
\cn{tiny} no longer produces the same typesize as it did before (now 6
instead of 5), except in compatibility mode. This might affect some
existing documents if they are updated to use \cn{documentclass} instead
of \cn{documentstyle}. Finally, new commands \cn{larger} and
\cn{smaller} are provided for changing the typesize relative to the
current size. These commands take an optional integer argument to
specify how many steps to go up or down: \verb'\larger[2]' means go up
two sizes, and \verb'\larger' without an optional argument is the same
as \verb'\larger[1]'. The list of sizes is a standard progression of
type sizes and associated linespacing values as defined by the
documentclass. If you need finer control over type size or linespacing,
consult the \latex/ documentation about the \cn{fontsize} command.
(Affects: \cls{amsart}, \cls{amsbook}.)

\item The \cn{qed} symbol is now an open square, not a filled black square,
and it is positioned at the right margin, instead of at a fixed
horizontal distance from the preceding text. 
(Affects: \cls{amsart}, \cls{amsbook}.)

\end{itemize}

\end{document}