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On a noncommutative algebraic geometry

(2015)

Banach Center Publications

Several sets of quaternionic functions are described and studied with respect to hyperholomorphy, addition and (non-commutative) multiplication, on open sets of ℍ, then Hamilton 4-manifolds analogous to Riemann surfaces, for ℍ instead of ℂ, are defined, and so begin to describe a class of four-dimensional manifolds.

On products of some Toeplitz operators on polyanalytic Fock spaces

Irène Casseli (2020)

Czechoslovak Mathematical Journal

The purpose of this paper is to study the Sarason’s problem on Fock spaces of polyanalytic functions. Namely, given two polyanalytic symbols f and g , we establish a necessary and sufficient condition for the boundedness of some Toeplitz products T f T g ¯ subjected to certain restriction on f and g . We also characterize this property in terms of the Berezin transform.

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