No it would be a theorem if it was proven.
Even more so. It's not even a theory anymore, it's a proven fact.
Putting it simply, theories and ideas are not proven scientific facts, but remain as such, an idea or a theory which have yet still to be proven.
A scientific theory
It can change if it is proven wrong, or if a new theory is proven more likely to be true.
albert einstiens theory was proven. his theory was the suns light bending over the moon.
This theory has proven the existence of God
a theory.
An extant theory is an idea that something is a specific way or is in existence. Extant theories are theories that have never been proven or found to be not true, so they are still viewed as a theory.
A common theory is a theory which has not been proven or a theory without evidence.
It is a law because it is proven that motion exists and does occur in the universe. However it is still considered a theory in the case of which ways motion may be achieved.
albert einstiens theory was proven. his theory was the suns light bending over the moon.
It is called a theory because that is precisely what it is. It is not called a theory because it 'isn't real'. Evidence is still coming in, and over the next few generations there will be a more solid sense that it is either NOT a good working model of the universe we observe, or it IS a good working model. As is true of any basic theory, it may one day be over-turned and another model will take its place. Edit: To add to the point made above - Germ Theory is still a "Theory". Although it has not been proven false, nor do we expect it to, so its assumed to be true. Same with gravity, General Relativity is only a theory, but its not been proven false, nor do we expect it to. That is how science works. Nothing is ever proven true. Theories can only be proven false and when theories stand up to rigorous testing and competition and are not able to be proven false, they then become accepted as being true. Theory of Evolution being a great example. We now know evolution is fact, but the Theory of Evolution is our attempt to describe the process of evolution and the theory.....itself....is still evolving.