“It’s not that math is hard: it’s that making sure you didn’t make any mistakes in your math, that is hard. “
Can you explain the Atiyah–Segal completion theorem?
OTOH, David Hilbert said in 1920 of trying to prove Fermat's Last Theorem:
`Before beginning I should have to put in three years of intensive study, and I haven't that much time to squander on a probable failure.'"