Yes by email (search the posted page for "@" or look under "Rewards" at https://cs.stanford.edu/~knuth/taocp.html#:~:text=Rewards https://cs.stanford.edu/~knuth

Yes by email (search the posted page for "@" or look under "Rewards" at https://cs.stanford.edu/~knuth/taocp.html#:~:text=Rewards https://cs.stanford.edu/~knuth/taocp.html#:~:text=Rewards ) And when I said "invited" I meant "strongly incentivized": by offering cash rewards (initially) and those highly prized "Knuth checks", he surely gets orders of magnitude more scrutiny and error reports than a typical academic.