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Obviously we don't possess, and probably will never possess, any standard of proof that is independent of time, the thing to be proved, or the person or school of thought using it. And under these conditions, the sensible thing to do seems to be to admit that there is no such thing,...
Fortunately research into the foundations of mathematics – typical for this century – has developed a notion of mathematical proof which is independent of any imagination. I will start from this notion, explain it by means of a few examples and I will try to show by means of further example...