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A minimum modulus theorem and applications to ultradifferential operators
A minimum modulus theorem and applications to ultradifferential operatorsIoana Cioranescu and Liszl6 Zsid6In this work we give a minimum modulus theorem which enables us to prove the invertibility of a large class of ultradifferential operators.It is known that the invertibility of convolution operators defined by ultradistributions S with compact support …