The magnitude of an 
-dimensional vector 
with entries 
is defined as 
The notation for this operation is either 
or 
. You might note that the 
is the identical symbol for absolute value of scalars. Indeed, a vector's magnitude is its absolute value away from the origin. One can think of vector magnitude as a generalization of absolute value to higher dimensions.
-dimensional vector with entries is defined as or . You might note that the is the identical symbol for absolute value of scalars. Indeed, a vector's magnitude is its absolute value away from the origin. One can think of vector magnitude as a generalization of absolute value to higher dimensions. Excercise 2-3.
Find the magnitude of the vector 
