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### The K-moment problem for compact semi-algebraic sets.

Mathematische Annalen

### Perturbations of Selfadjoint Operators with Point Spectra by Restrictions and Selfadjoint Extensions.

Mathematische Annalen

### Non-commutative moment problems.

Mathematische Zeitschrift

### On Commuting Unbounded Self-Adjoint Operators. III.

Manuscripta mathematica

### Left-covariant differential calculi on $S{L}_{q}\left(N\right)$

Banach Center Publications

We study ${N}^{2}-1$ dimensional left-covariant differential calculi on the quantum group $S{L}_{q}\left(N\right)$. In this way we obtain four classes of differential calculi which are algebraically much simpler as the bicovariant calculi. The algebra generated by the left-invariant vector fields has only quadratic-linear relations and posesses a Poincaré-Birkhoff-Witt basis. We use the concept of universal (higher order) differential calculus associated with a given left-covariant first order differential calculus. It turns out...

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