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On a weak Lie type for vectors
Tove Dahn
In the symbol space for differential operators, we discuss a scalar type for change of local coordinates, using vector valued distributions. In particular, we discuss P-convexity f…
Some remarks on vector valued distributions
Tove Dahn
We argue that the fundamental solution corresponding to a maximal rank differential operator, where the symbol is regarded as a vector valued distribution, is not necessarily very…
Some remarks on maximal rank
Tove Dahn
We argue that the spiral can, in presence of a maximum principle, be of maximal rank at a boundary, but does not preserve hypoellipticity.
Some remarks on polar sets to sums of squares
Tove Dahn
We argue that a necessary condition for hypoellipticity is that the polar is not a spiral domain.
Some remarks on Schr{ö}dinger operators
T. Dahn
The problem we consider is given a mixed model and a potential such that , to determine a movement…
Some remarks on mixed problems
Tove Dahn
I will attempt to represent a symbol to a ps.d.o., using two bases and a lifting functional. The representation is based upon an invariance principle and conditions on the boundary…