The dot product of two vectors a = ( a1 , a2 , ... , an ) and b = ( b1 , b2 , ... , bn ) is defined as : where Σ denotes summation notation and n is the dimension of the vector space .
The dot product of two vectors a = ( a1 , a2 , ... , an ) and b = ( b1 , b2 , ... , bn ) is defined as : where Σ denotes summation notation ( the sum of all the terms ) and n is the dimension of the vector space .