Advanced Math

Question :
What is 'Involution' ?

Answer :
An operation, which, when applied to itself, returns the original number.
f ( f(x) ) = x for all x in the domain of f.
In linear algebra, an involution is a process of raising a number to a power.
The identity map is a simple example of an involution. Some other examples include multiplication by -1 in arithmetic, the taking of reciprocals, complementation in set theory and complex conjugation.
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