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“Dragomir Sample˙Fm”— 2011/10/1 — page i —#1
HARMONIC VECTOR
FIELDS
“Dragomir Sample˙Fm”— 2011/10/1 — page iii —#3
HARMONIC VECTOR
FIELDS
VARIATIONAL PRINCIPLES AND
DIFFERENTIAL GEOMETRY
SORIN DRAGOMIR
Universita` degli Studi della Basilicata
DOMENICO PERRONE
Universita` del Salento
Amsterdam • Boston • Heidelberg • London
New York • Oxford • Paris • San Diego
San Francisco • Singapore • Sydney • Tokyo
“Dragomir Sample˙Fm”— 2011/10/1 — page iv —#4
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