The use of algebraic methods for studying analysts is an important theme
in modern mathematics. The most significant development in this field is
microlocal analysis, that is, the local study of differential equations
on cotangent bundles. This treatise provides a thorough description of
microlocal analysis starting from its foundations. The book begins with
the definition of a hyperfunction. It then carefully develops the
microfunction theory and its applications to differential equations and
theoretical physics. It also provides a description of microdifferential
equations, the microlocalization of linear differential equations.
Finally, the authors present the structure theorems for systems of
microdifferential equations, where the quantized contact transformations
are used as a fundamental device.
The microfunction theory, together with the quantized contact
transformation theory, constitutes a valuable new viewpoint in linear
partial differential equations.
Originally published in 1986.
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