A proof in geometry is basically proving a specific thing, like this segement is congruent to this, or proving something is a parallelogram....there are all sorts of very different kinds of proofs....
A proof is a very abstract thing. You can write a formal proof or an informal proof. An example of a formal proof is a paragraph proof. In a paragraph proof you use a lot of deductive reasoning. So...
Proof is not a coin grade but a type of coin manufacturing. In the United States a proof coin is struck at least two times in a clean, polished die. The result is an polished finish with greater...