Question

Could you clarify your claim regarding logical proofs? That is, that there is no such thing as a logical proof, and that every logical proof contains begging the question. After all, if one wants to prove that a triangle is right-angled, where is the begging of the question? In this case, for example, do you mean the axioms of Euclidean geometry?
And one more thing: are the statements “the burden of proof always lies on the one making the affirmative claim” and “from the standpoint of science, everything is false until proven otherwise” correct?
 
Thank you