Points in a Line
One of the differences in views of zero is with simple matters such as:
Q: If a point is an imaginary, dimensionless object, how many points
are there in a line 1cm long?
A: If viewed as { 0 } then 1 / 0 = Type
2 infinity
A: If viewed as { } then 1 / 0 = 0
On the other hand, if we re-define a point to be any arbitrarily small
value greater than zero, then both views give the answer as a Type
1 infinity. The key difference is when a point has exactly zero size.
At first this may seem a counter-intuitive result when using { }, but
it is easily proved: If we can divide a line into an infinite number of
zero-sized points, then we should also be able to construct a line from
zero-sized points.
Try building a line using only zero-sized points and you soon realise
it cannot be done. Starting at 0, simply stack up zero-sized points until
you get to 1. No matter how many points you add, even an infinite number,
you never move from 0.
We can derive from this another principle for the null view of zero in
physics:
Null Principle #2: Dimensionless points
are purely imaginary and can play no part as quantities in the
mathematics of physics.
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