Abstract
The aim of this note is to classify the finite solvable groups with an irreducible character that vanishes on just one class of elements.
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ACKNOWLEDGMENTS
The author is very grateful to the referee and Professor Alexandre Turull for their valuable suggestion and help. The project supported by the NSF of Jiangsu Education Committee (05KJB110002) and the NSF of China (10571128).
Notes
Communicated by A. Turull.