The regular part of second-order differential sectorial forms with lower-order terms
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We present a formula for the regular part of a sectorial form that represents a general linear second-order differential expression that may include lower-order terms. The formula is given in terms of the original coefficients. It shows that the regular part is again a differential sectorial form and allows to characterise when also the singular part is sectorial. While this generalises earlier results on pure second-order differential expressions, it also shows that lower-order terms truly introduce new behaviour.
Mathematics Subject Classification (2000)Primary: 47A07 Secondary: 35J70
KeywordsDifferential sectorial forms non-closable forms regular part degenerate elliptic operators
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