I am a mathematical illiterate, so I do not know what people mean when they say "equipped".
For example, I say that a Hilbert space is a vector space equipped with an inner product. What does that actually mean?
Obviously, one interpretation is to picture professor Hilbert as a plumber with an extra tool hanging out of his back pocket (a.k.a. an inner product), but mathematically why can't we do the inner product in a vector space?
Both Hilbert space and vector space work with functions and vectors, don't they?
Why can't we define a space where all operations are possible?
Best Answer
The word "equipped" keeps notational pandemonium from breaking loose. For instance, if you were to be a bit more formal, you'd say
But most of the time, there's no reason to disambiguate between the vector space and the inner product (who puts a different inner product on the set $L^2[0,1]$?), so we refrain from defining these "pairs", and simply "equip" our space.