I have read the wiki page (https://en.wikipedia.org/wiki/Functional_(mathematics) but it is not helping.(adsbygoogle = window.adsbygoogle || []).push({});

I understand what a regular function is

input > do something to that input > output.

but not what functional is,

Wikipedia says "from a vector space into its underlying field of scalars"

That wording is confusing.

So the input is a vector but the output is a scalar? The only way I know to get scalar from vector is a dot product.

And a vector is just written as <a,b> , if you take that as an input isn't it just essentially a regular function of 2 variables? y=f(a,b)

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# I What is a "functional"

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