Exponential notation for function spaces

https://arbital.com/p/5k7

by Izaak Meckler Jul 24 2016 updated Jul 25 2016

Why $Y^X$ is good notation for the space of maps from $X$ to $Y$


If and are sets, the set of functions from to (often written ) is sometimes also written . This latter notation, which we'll call exponential notation, is related to the notation for finite powers of sets (e.g., for the set of triples of elements of ) as well as the notation of exponentiation for numbers.

Without further ado, here are some reasons this is good notation.

More generally, is good notation for the exponential object representing in an arbitrary cartesian closed category for the first set of reasons listed above.


Comments

Patrick Stevens

If and are sets, the set of functions from to \(often written \) is sometimes also written \. This latter notation, which I'll call exponential notation, is related to the notation for finite powers of sets \(e\.g\., for the powers of triples of elements of \) as well as the notation of exponentiation for numbers\.

I don't think this is what you mean, is it?