An operation on 
,
where 
is a set, is a function from a power
of 
into 
. More precisely, given an ordinal
number 
,
a function from 
into 
is an 
-ary operation on 
. If 
is a finite ordinal, then the 
-ary operation 
is a finitary operation on 
.
Operation
See also
Operator, PrecedenceThis entry contributed by Matt Insall (author's link)
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Cite this as:
Weisstein, Eric W., with contributions by Matt Insall. "Operation." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Operation.html