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**s**

and

**v**

What is the notation for the distance between them?

I know to calculate the distance I would use:

r = SQRT ( (s1-v1)^2 + (s2-v2)^2 + (s3-v3)^2 )

where s1 is the first element in the position vector

**s**etc.

What is an equation that represents this? Can I use the equation:

r= ||(

**s**-

**v**)||

where ||x|| is the modulus function?