[Eric]

Actually, you can't include any existing principle in mathematics or physics. All of them are assumptions and time is no exception.

It is impossible for theory to advance, using an axiomatic system of logic. Deriving a proof(s) from an assumption works in application, because to make things and go places, only requires an approximation to a high degree of certainty.

To make an advance in theory, requires an initial proof that is not derived from an assumption. All other proofs that follow, will also have to contain no assumptions.