In science, a theory is, by definition, proven and accepted as fact.
It's probably best. You may not want to but you can if you want to prove that your theory was correct.
The same reason any other theory is accepted: it explains known observations and it makes predictions that are testable by experiment (and prove correct when tested).
By performing experiments whose goal is to prove that such theory is a mistaken theory.
prove the intersction for crisp set theory
The phlogiston theory has been debunked by the discovery of oxygen. When materials burn, they combine with oxygen, not phlogiston as believed in the theory. The understanding of combustion and oxidation provided by oxygen led to the rejection of the phlogiston theory.
Newton explained his theory
No theories are correct. That is why they are called theories. These are the best that can be done with present knowledge, they explain and make prediction that could otherwise not be made. If those explanations are useful and the predictions turn out to be correct it strengthens the theory. It does not prove it. When a theory is proven to be true it is then called a law.
You create a theory. Prove the theory to be true by testing it. If it works, it is true. If it does not work, it is not true.
yes it can prove ....
Einstein didn't prove the theory of relativity. It is a theory, a possible explanation, it is generally accepted because it explains a lot of things but that doesn't "prove" the theory, at least not to physicists. See related questions for the country of discovery.
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Because the whole of a theory is that it cannot be proven...