Math E-320:

Teaching Math with a Historical Perspective

Mathematics E-320:

Instructor: Oliver Knill

Office: SciCtr 434

Email: knill@math.harvard.edu

The proof that the altitudes hit in a common point. The proof reduces it to the fact that the perpendicular bisectors intersect in a common point. Credit: I owe this remark to Cody Patterson, who learned it from a student of his.

Please send questions and comments to knill@math.harvard.edu