# Declarations

A declaration is a LaTeX command that does not act on an argument, but which changes the way LaTeX prints the following text or which changes the value or meaning of some command or counter.

## Scope

The scope of a declaration begins with the declaration command itself and is ended by a right brace (}) or an \end{} command whose matching left brace ({) or \begin{} precedes the declaration. The declaration is in effect within its scope, exept that it may be countermanded by another declaration whose scope is a subset.

Every declaration has an environment of the same name. If \decl is a declaration command, then


\begin{decl} .... \end{decl}

is equivalent to
  {\decl .... }


However, some declarations are global; they are in effect until countermanded by another declaration. They include