Question about vectors.

I can't figure out how to tell which is a vector or not.


Which of the following are vectors? (Select all that apply.)
1
|vector v|
5*vector p
r
<vx, vy, vz>
vector a
vector r/2

They're all vectors.

-1 is a scalar, could be considered a vector in R (or C, etc.)
-|vector v| is the magnitude of a vector and is thus a scalar
-5*vector p is a scalar multiplied by a vector and is thus a vector
-r could be a vector, depends on what it stands for
-<vx, vy, vz> sounds like a vector in R^3 (or C^3, etc.)
-vector a sounds an awful lot like the name of a vector to me
-vector r/2 I'm guessing means a vector named r multiplied by the scalar 1/2, so it would also be a vector