researcher

S. Hassi

32 papers hereh-index 252.6k citations146 works total

Matching runs newest-first, so older work may not be attached to this profile yet.

author position

first author15
middle author8
last author7

Across the 30 of 32 papers where every author was matched, so the position is known.

fields

math.FA28
math.SP3
math.CA1

same name

S. Hassi — 2 papers, h 1

Either other researchers who publish under this name, or the same person where the external sources have not merged their records.

identity via Semantic Scholar / OpenAlex

activity

20052025

most citedBoundary relations and generalized resolvents of symmetric operators

103 citations · 129 across the 29 of their papers we have counts for

collaborators

Showing 2008Show all

2 papers · 1 filter

math.FA2008

Theorem of completeness for a Dirac-type operator with generalized $λ$ -depending boundary conditions

Seppo Hassi, Leonid Oridoroga

A completeness theorem is proved involving a system of integro-differential equations with some $λ$ -depending boundary conditions. Also some sufficient conditions for the root func…

math.SP2008

On Symmetries in the Theory of Finite Rank Singular Perturbations

Seppo Hassi, Sergii Kuzhel

For a nonnegative self-adjoint operator $A_{0}$ acting on a Hilbert space $H$ singular perturbations of the form $A_{0} + V, V = \sum_{1}^{n} b_{ij} < ψ_{j}, \cdot > ψ_{i}$ are studie…

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Data

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Theorem of completeness for a Dirac-type operator with generalized λ-depending boundary conditions

On Symmetries in the Theory of Finite Rank Singular Perturbations

Theorem of completeness for a Dirac-type operator with generalized $λ$ -depending boundary conditions