Let's do it clearer
The Man said:
A point does not have cardinality, but a set containing a point (as apparently are trying to represent in your “example”) does
You still miss it.
If a set that containing a point has cardinality 1 it means that the contained is not nothing even if the considered universe is Dimension.
The set that containing no apples has cardinality 0 if the considered universe is Apples.
In other words, “0 apples” is equivalent to “0 points”, but “0 points” is not equivalent to “0 dimension”, so your “0 apples” argument does not hold water.
The Man said:
Who ever said a point or a set containing a point it was “nothing”?
That is why a point is an existing thing that has 0 dimension.
Since 0 dimensional element and 1 dimensional element are both existing things under the universe of Dimensions, then 1 dimensional element is included NXOR excluded w.r.t 0 dimensional element under that universe, and 0 dimensional element is included XOR excluded w.r.t 1 dimensional element under that universe.
Furthermore, there is a difference between “element”, which is a non-composed thing, and “object” that can be a composed thing (in both cases we are talking about existing things, where contained existing things of some set is resulted by cardinality > 0 of the considered set).
The Man said:
Subtracting some one dimensional object (like a line segment) from a one dimensional space (like a line or a line segment) can still leave you with a one dimensional object or multiple one dimensional objects.
A line segment is a composed result of 0 and 1 non-composed dimensional spaces.
You simply can’t grasp the notion of existing and non-composed things, because you do not understand differences that are based on magnitudes.
The one who enables to get differences that are based on magnitudes (where Magnitude is defined according to “How much?” question, which is essentially different than “How many?” question) , immediately grasps the difference of the existing 0 dimensional element and 1 dimensional element w.r.t each other.
The Man said:
Are you claiming you “point” to be one dimensional by your “|{.}| = 1” “example”?
No, I am claiming that a point is an existing element and the cardinality of a set that includes it as a member, clearly demonstrates it.
The Man said:
Actually I’m currently in the business of fixing things.
Start by fixing your reasoning's abilities (for example: the difference between “How much?” and “How many?” questions).
Some exercises:
How much size a point has?
Does an element that has 0 size exists?
What is the cardinality of a set that have at least a point as its member?