> ... print some small cards with "No, I won’t listen to your app idea" > Dear Sir, Thank you for your proof of Fermat's Last Theorem. The first error is on pa

> ... print some small cards with "No, I won’t listen to your app idea" > Dear Sir, Thank you for your proof of Fermat's Last Theorem. The first error is on page _____. This is said to be Hilbert or Landau. He had this printed on the cards and he would have an undergraduate to fill in the blank and mail it back to an author whenever a new proof of Fermat's Theorem was received :)