The sum of two points does not mean anything, geometrically. You can mechanically form the sum of two column vectors that represent points, but the result is meaningless.

You have reached the end of this chapter. Perhaps you would like to see if you remember any of it:

- Head to tail rule for geometric vector addition.
- Head to tail rule in three dimensions.
- Associative property of vector addition.
- Commutative property of vector addition.
- Coordinate frames.
- Representing points using coordinate frames and column matrices.
- Representing points using coordinate frames and column matrices.
- Parallelogram in vector addition
- Triangle inequality
- Collinear vectors.
- Zero vector addition.
- Point plus vector addition.

The next chapter will further
discuss operations on vectors.
The chapter after that will
discuss further operations on vectors.
The chapter after *that* will further
discuss further operations on vectors.
It is going to be a long semester.