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Service hours in Frankfurt am Main from 1 December 2025: Monday to Friday 9:00-18:00 and Saturday 10:00-16:00

Wegen Wartungsarbeiten ist vom 12. bis 14. Januar 2026 der Museumslesesaal, sowie vom 14. bis 16. Januar 2026 der Musiklesesaal geschlossen. // Due to maintenance work the museum reading room will be closed from 12 to 14 January 2026 and the music reading room from 14 to 16 January 2026.

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	21	Factorizations and Power Weighted Rellich and Hardy–Rellich-Type Inequalities Enthalten in The journal of geometric analysis Bd. 35, 24.4.2025, Nr. 6, date:6.2025: 1-49
	22	Logarithmic refinements of a power weighted Hardy–Rellich-type inequality Enthalten in Annals of functional analysis Bd. 15, 8.8.2024, Nr. 4, date:10.2024: 1-11
	23	On a question of A. E. Nussbaum on measurability of families of closed linear operators in a Hilbert space Enthalten in Israel journal of mathematics Bd. 188, 1.8.2011, Nr. 1, date:3.2012: 195-219
	24	On Factorizations of Analytic Operator-Valued Functions and Eigenvalue Multiplicity Questions Enthalten in Integral equations and operator theory Bd. 82, 13.12.2014, Nr. 1, date:5.2015: 61-94
	25	On the Global Limiting Absorption Principle for Massless Dirac Operators Enthalten in Institut Henri Poincaré: Annales Henri Poincaré Bd. 19, 17.4.2018, Nr. 7, date:7.2018: 1993-2019
	26	On the Witten index in terms of spectral shift functions Enthalten in Journal d'analyse mathématique Bd. 132, 29.6.2017, Nr. 1, date:6.2017: 1-61
	27	Spectral $$\varvec\zeta }$$ ζ -functions and $$\varvec\zeta }$$ ζ -regularized functional determinants for regular Sturm–Liouville operators Enthalten in Research in the mathematical sciences Bd. 8, 27.10.2021, Nr. 4, date:12.2021: 1-46
	28	Strict domain monotonicity of the principal eigenvalue and a characterization of lower boundedness for the Friedrichs extension of four-coefficient Sturm–Liouville operators Enthalten in Acta scientiarum mathematicarum Bd. 88, 8.8.2022, Nr. 1-2, date:8.2022: 189-222
	29	The Jacobi Operator on $$(-1,1)$$ ( - 1 , 1 ) and Its Various m-Functions Enthalten in Complex analysis and operator theory Bd. 18, 17.9.2024, Nr. 7, date:10.2024: 1-69
	30	Gesztesy, Fritz 1953- / Mathematiker