## Q.E.D. "Quod Erat Demonstrandum", used at the end of proofs

Submitted by robkimmel on 19 December 2012 - 11:23amForums:

Has anyone encountered an interesting hand-lettered or type-set "Q.E.D." before? It's used to mark the end of a mathematical proof. The contemporary digital version is, unfortunately, the "tombstone," a simple black square (yawn).

Thanks!

Rob Kimmel