Why are the Gergonne and Soddy Lines perpendicular ? A synthetic approachWhy are the Gergonne and Soddy Lines Perpendicular? A synthetic approach.

by Feng, Zuming

101 problems in algebra from the trainnig of the USA IMO Team /

by Andreescu, Titu 1956-, Andreescu, Titu 1956-, Feng, Zuming
Published 2001

103 trigonometry problems : from the training of the USA IMO Team /

by Andreescu, Titu 1956-, Andreescu, Titu 1956-, Feng, Zuming
Published 2005

104 number theory problems : from the training of the USA IMO Team /

by Andreescu, Titu 1956-, Andreescu, Titu 1956-, Andrica, Dorin, Feng, Zuming
Published 2007