Is the set of aggregation functions easy to characterise? I mean functions like addition, multiplication, maximum, minimum, count...(adsbygoogle = window.adsbygoogle || []).push({});

So basically everything thats commutative and associative:

[tex]

f(x,y)=f(y,x)

[/tex]

[tex]

f(f(x,y),z)=f(x,f(y,z))

[/tex]

What are other classes of such functions?

I can't all map to just addition, can I? I'd have no idea how to do it with the max(x,y) function?!

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# Aggregation functions

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