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I am reading Concrete Mathematics now and found a printing error,I have sent email to him.

How long the email will be got reply?I heard that he do not use email now,is it necessary to write a snail mail?

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This should be retagged, but know not into what. –  Arthur Oct 17 '12 at 11:14
    
If this proposal had gone through, I'd know how to tag it :-). (BTW I'm collecting examples of errata-related questions, of which there are quite a number, and will be reproposing that tag some time.) –  joriki Oct 17 '12 at 11:29
    
I don't think this question has an answer other than as long as it takes him to reply. He is, presumably, a very busy man and it could take a very long time. Out of interest, which edition are you reading and what was the mistake? –  Sam Jones Oct 17 '12 at 12:06
    
I gave it "soft-question" and "mathematicians" since it is more about Knuth's idiosyncratic reward system than anything else. –  Nate Eldredge Oct 17 '12 at 12:25
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1 Answer

Knuth's web page for Concrete Mathematics explains very specifically how to contact him regarding errors in the text, and lists those which are already known.

His web page also has a FAQ about rewards. Due to his concerns about personal checks, he does not send out real money anymore. Instead, rewards are now "deposited" to a fictitious bank whose "account balances" are listed on the web.

So you still get the notoriety, even without the cash.

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