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One measure of hardness might be how long it takes to write up a computer-checkable proof of the theorem in question. It took a few months for a colleague of mine to produce a completely formal proof of the prime number theorem, so in that sense it is still hard.

The same goes for the Jordan curve theorem. As for the Riemann mapping theorem, I don't know that there is a computer-checkable proof yet.

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One measure of hardness might how long it takes to write up a computer-checkable proof of the theorem in question. It took a few months for a colleague of mine to produce a completely formal proof of the prime number theorem, so in that sense it is still hard.

The same goes for the Jordan curve theorem. As for the Riemann mapping theorem, I don't know that there is a computer-checkable proof yet.