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How can I undefine an environment?

This is how to undefine a command:


I need to undefine the spacing environment from the setspace package. This does not seem to work:

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up vote 14 down vote accepted

The macro \newenvironment{foo} defines the two macros


not \beginfoo.

Rather than undefine spacing, you could simply make it a noop:


This is preferable because it will keep track of nested environments.

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