<!-- Please do not remove or change this AfD message until the issue is settled -->
<!-- The nomination page for this article already existed when this tag was added. If this was because the article had been nominated for deletion before, and you wish to renominate it, please replace "page=Dangerously irrelevant" with "page=Dangerously irrelevant (2nd nomination)" below before proceeding with the nomination.
-->{{AfDM|page=Dangerously irrelevant|logdate=2008 November 29|substed=yes }}
<!-- For administrator use only: {{oldafdfull|page=Dangerously irrelevant|date=29 November 2008|result='''keep'''}} -->
<!-- End of AfD message, feel free to edit beyond this point -->
In [[statistical mechanics]] and [[quantum field theory]], a '''dangerously irrelevant''' operator is an operator which is [[irrelevant]], but yet affects the [[infrared]] physics significantly because the [[vacuum expectation value]] of some field depends sensitively upon the dangerously irrelevant operator.
