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— title: `\spacefactor` complaints category: errors permalink: /FAQ-atvert date: 2014-06-10 —

# `\spacefactor` complaints

The errors ```latex ! You can't use `\spacefactor' in vertical mode. \@→\spacefactor

`               \@m `

``` or ```latex ! You can't use `\spacefactor' in math mode. \@→\spacefactor

`               \@m `

``` or simply ```latex ! Improper \spacefactor. … ``` bite the LaTeX programmer who uses an internal command without taking `precautions`. An internal-style command such as `\@foo` has been defined or used in a private macro, and it is interpreted as `\@`, followed by the `text` `foo`. (`\@` is used, for real, to set up end-of-sentence space in some circumstances; it uses `\spacefactor` to do that.)

The problem is discussed in detail in `[`@` in macro names](/FAQ-atsigns)`, together with solutions.

2_programmation/erreurs/i/improper_spacefactor.1527718257.txt.gz · Dernière modification: 2018/05/31 00:10 par d.p.carlisle