Vector definition
A vector is an n-tuple of real numbers. A tuple is a finite ordered list of elements. An n-tuple is an ordered list of elements which has n dimensions. In the context of games n is usually 2, 3, or 4. An n-dimensional vector 
is represented as follows:
The subscript numbers 
are called the components of the vector. Components are expressed as a number or as a letter corresponding to the axis that component represents. Subscripts are ...
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