1

I want to increase just the font size of the word Hello, more than the specific size provided by \Huge, in the document:

\documentclass[12pt]{amsbook}

\begin{document}
{\Huge Hello} world!
\end{document}

How can I do this?

6
\documentclass[12pt]{amsbook}
\usepackage{graphicx}
\begin{document}
{\Huge Hello} world!

\scalebox{5}{Hello} world!
\end{document}
5

I hope \documentstyle is a typo, because the command has been deprecated for about a quarter of a century.

Since you're using amsbook, you have \larger:

\documentclass{amsbook}

\begin{document}

{\larger Hello} world!

{\larger[2]Hello} world!

{\larger[3]Hello} world!

{\larger[4]Hello} world!

{\larger[5]Hello} world!

\end{document}

enter image description here

I hope that \documentstyle is a typo: the command has been deprecated for 25 years.

If you want to scale at arbitrary sizes the default Computer Modern, you need to load fix-cm.

\RequirePackage{fix-cm}
\documentclass{amsbook}

\newcommand{\size}[2]{{\fontsize{#1}{0}\selectfont#2}}
\newenvironment{sizepar}[2]
 {\par\fontsize{#1}{#2}\selectfont}
 {\par}

\begin{document}

Hello world! \size{20}{Hello} \size{30}{Hello} \size{40}{Hello} world!

\begin{sizepar}{20}{26}
A paragraph typeset at 20pt size
A paragraph typeset at 20pt size
A paragraph typeset at 20pt size
A paragraph typeset at 20pt size
\end{sizepar}

\end{document}

enter image description here

The first argument to sizepar is the font size, the second argument is the baselineskip (in points if no unit is specified, which is possible, so also \begin{sizepar}{1cm}{1.4cm} is legal).

  • And How can I use <b>\larger</b> with other document classes? Or is there any equivalent command that make some words larger?? – Ali Ashja' Sep 25 '19 at 8:27
  • @AliAshja' There's the package relsize – egreg Sep 25 '19 at 9:20
3

or

\documentclass[12pt]{amsbook}% <--- with latex2e is "documentstyle" deprecated
\usepackage{lmodern}  %<---

\begin{document}
{\fontsize{88}{104}\selectfont Hello} world!
\end{document} 

enter image description here

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