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First Edition Preface Second Edition Preface Acknowledgments
shearing instability—1. Same as Helmholtz instability. 2. A complex hydrodynamic instability phenomenon exhibited by a stratified shear flow. A necessary condition for this type of instability is that the local Richardson number is somewhere less than one-quarter.
Drazin, P. G., and W. H. Reid, 1981: Hydrodynamic Stability, Cambridge University Press, 325–333.