Education: Dean's Problems

Demonstrate that if two trihedral angles have dihedral angles respectively equal, then their face angles are equal.

For 15 years Columbia's Dean Herbert Edwin Hawkes has dangled this poser before his freshman class in mathematics. Prize for solution, by solid geometry only, was an automatic A in the course. Fifteen flights of freshmen were baffled until this term when one Herman Gewirtz of Brooklyn slapped down a solution complete in 50 steps, plus drawings.

"Beautiful!" cried Dean Hawkes.

"What would have been your solution?" asked a newshawk last week.

"Well, now," hemmed the Dean,...

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