# Mathematical Digest

### Short Summaries of Articles about Mathematics

in the Popular Press

Review of *Computers, Ltd:. What They ***Really** Can't Do, by DavidHarel. *Science,* 9 March 2001,

"Although we have all grown accustomed to nearly continuous improvements in theperformance of hardware and software (and reductions in their costs), computersare subject to fundamental constraints that will limit what they can do," thereview states. Harel's book focuses on the known limitations of computers andoffers perspectives on developments and new approaches in the field.

*--- Annette Emerson*