Fixed point
From AoPSWiki
A fixed point of a function, permutation or other such operator 
is a value 
such that 
, i.e. acts like the identity at .
This article is a stub. Help us out by expanding it.
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A fixed point of a function, permutation or other such operator is a value such that , i.e. acts like the identity at .
This article is a stub. Help us out by expanding it.
