I think it is addition
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secret XD All of physics is one of two things: experiments and the mathematical concepts and principles that are derived to explain them. So you are really asking "Teach me all of theoretical physics".
It is a mathematical concept. It does not have a concrete existence.It is a mathematical concept. It does not have a concrete existence.It is a mathematical concept. It does not have a concrete existence.It is a mathematical concept. It does not have a concrete existence.
I think the ancient Egyptians had the concept albeit a rough approximation eg 22/7
Neutrality is a political concept, not a mathematical concept. It means not taking sides.
It was simply the concept of the symbol 0 as having a mathematical value.