Did you know that 5 year-olds cannot grasp the concept of number?
By standard mathematics you have Natural Numbers, Rational Numbers, Irrational numbers, etc... , but there is no general definition to Number.
Children may not understand the sophisticated manipulations that adults can do with numbers, but they have a simple (and simple is not trivial) point of view of the concepts that can lead to the general definition of Number, as I did in my theory.
A number is the simplest building-block of the researchable.
Your sophisticated manipulations of that building-block, do not allow you to get this beautiful and straightforward simplicity, because your ability to get simple notions was lost over the years of your mathematical sophisticated training.
So is the case of a line or a point, they are undefined terms, and understood according different context dependent axiomatic systems that there is no common basis between them accept that they are using the words "Line" and/or "Point".
In other words, there is no generalization of these concepts according to the context dependent paradigm.
Since most of the axiomatic systems are using sets, then the concept of Line is not an
atom, but it is a thing that is defined by other building-blocks (you can call them points or not, but it does not change the fact that a line is not an atom by standard Math.)
Professional mathematicians do not afraid to use Lines and points as related object (only people that have troubles with their abstract abilities avoid it).
For example:
1. Why set theory?
Why do we do set theory in the first place? The most immediately familiar objects of mathematics which might seem to be sets are geometric figures: but the view that these are best understood as sets of points is a modern view. Classical Greeks, while certainly aware of the formal possibility of viewing geometric figures as sets of points, rejected this view because of their insistence on rejecting the actual infinite. Even an early modern thinker like Spinoza could comment that it is obvious that a line is not a collection of points (whereas for us it may hard to see what else it could be) (Ethics, I.15, scholium IV, 96).
http://www.seop.leeds.ac.uk/entries/settheory-alternative/
Prof. Randall Holmes (
http://math.boisestate.edu/~holmes/ )
Hilbert:
I.1: Two distinct points A and B always completely determine a straight line a. ...
(
http://en.wikipedia.org/wiki/Hilbert's_axioms )
Well, Hilbert is wrong, because a non-local element like a line cannot be completely determined by local elements like points.
I explicitly show it by using Symmetry as the basis of non-locality and Asymmetry as the basis of locality.
Furthermore, I explicitly show that Symmetry/ Asymmetry is the basis of Logic itself.
It is rigorously written in
http://www.geocities.com/complementarytheory/NXOR-XOR.pdf .