There has been ongoing efforts to interconnect or fuse two or more different fields of science or technologies under one larger umbrella of study in order to expand the boundary of understanding or extend the possibility of new findings such as physicists working for the medical development using particle accelerators. But then, the question we can ask when we move one step back is that why we have such fields of studies from the beginning? When and how we define the study called "Physics"?
The easiest understandable group of numbers might be "Natural numbers" because this is directly related our physical experience. Whereas integers or irrational numbers are a bit harder to understand because these are derivatives of our thinking, or extended definition.
Among the four basic operations, deduction, multiplication and division are not born together with the addition. Long time ago, in the beginning of history, we might not need any deduction, multiplication or division. Human didn't need to deduct something from other things when there had been no deprivation. Human didn't need to multiply when they can just add whatever they need at the moment.
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