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On pseudoelliptic systems of first order differential equations
Published online by Cambridge University Press: 22 January 2016
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In the study of elliptic differential operators of second order, we found that the automorphism pseudogroups are of finite type ([4]). However this fact takes a complete change in elliptic differential operators of first order.
So as to make the objects which can be dealt with clear, we introduce the concept of pseudoellipticity of first order differential operators (Definition 1.1), which is naturally satisfied by first order elliptic differential operators.
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- Copyright © Editorial Board of Nagoya Mathematical Journal 1987
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