A check from Knuth

While I was teaching a class based on Concrete Mathematics by Ronald L. Graham, Donald Knuth and Oren Patashnik, I found a (rather minor) mistake in the book. In their prologue, the authors say:

We have tried to produce a perfect book, but we are imperfect authors. Therefore we solicit help in correcting any mistakes that we've made. A reward of $2.56 will gratefully be paid to the first finder of any error, whether it is mathematical, historial or typographical.

I wrote to the corresponding e-mail address, and in a little while I got this check:

Mi cheque de Don Knuth

Together with the check there was a copy of my message with a handwritten annotation by Knuth: This error has been present since the first printing of the first edition in 1988! Also in the Portuguese translation.

Indice

  1. Homepage
  2. Research
  3. Teaching
  4. Other stuff
    1. My collection of quotations
    2. A check from Knuth
    3. Cosas que regalarme...
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  6. How to contact me

mariano@dm.uba.ar