In mathematical writing, when b denotes a vector, which sentence is correct when we want to mention that b is a vector?
a) We multiply the b vector by ...
b) We multiply the vector b by ...
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I would tend to put the description of the vector before the word vector, and the name of the vector after the word vector.
So for example, with v being the vector which measures velocity, I might say:
- the vector v is the velocity
- the velocity vector is v
- the velocity vector v ...
though I would not reject "the v vector is the velocity" as being wrong.