More little word games. Please restrict yourself to posts in English. I'm sure you'd love to construct another language in which a deduction is in fact an assumption, but that's not the one we're using here.
That nothing can travel faster than the speed of light is a consequence of special relativity, not an assumption. Deal with it.
Actually I consider it a word game that science would make propositions related to unobserved, unrecorded history, call it a "theory," and proceed as if making statements of unassailable certitude. It's a huge word game of self-delusion perpetrated upon an often uncritical audience. In some circles it appears to be coming to an end.
Please restrict yourself to posts in English.
I have been, and I will continue to do so.