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From How can I see the "implementation" of the \LaTeX command? and How to write (La)TeX (with parentheses) [or any other TeX-related logo], I learn that \LaTeX is implemented as

L\kern -.36em{\sbox \z@ T\vbox to\ht \z@ {\hbox {\check@mathfonts \fontsize \sf@size \z@ \math@fontsfalse \selectfont A}\vss }}\kern -.15em\TeX

The \kern parameter needs to be tweaked according to the font used, as pointed out by Knuth in a TUGboat article. When trying to change that parameter in the code above, however, I get the error ! Undefined control sequence. <argument> \z.

How can I tweak the \kern value of the \LaTeX command (and of the \TeX command)?

\documentclass{article}
\renewcommand{\LaTeX}{L\kern -.20em{\sbox \z@ T\vbox to\ht \z@ {\hbox {\check@mathfonts \fontsize \sf@size \z@ \math@fontsfalse \selectfont A}\vss }}\kern -.10em\TeX}

\begin{document}
\LaTeX
\end{document}
Community
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Sverre
  • 20,729

1 Answers1

6

The command being used is \z@, not \z. Wrap the redefinition in \makeatletter/\makeatother.

\documentclass{article}
\makeatletter
\renewcommand{\LaTeX}{L\kern -.20em{\sbox \z@ T\vbox to\ht \z@ {\hbox {\check@mathfonts \fontsize \sf@size \z@ \math@fontsfalse \selectfont A}\vss }}\kern -.10em\TeX}
\makeatother

\begin{document}
\LaTeX
\end{document}
Sean Allred
  • 27,421