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Principal type, partial differential operator of. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Principal_type,_partial_differential_operator_of&oldid=48292
Principal type, partial differential operator of. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Principal_type,_partial_differential_operator_of&oldid=48292
This article was adapted from an original article by A.A. Dezin (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article