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I maintain a list of Addenda and Corrigenda for my papers.

Preprints

[62] R. Garappa, S. Gerhold, M. Popolizio, T. Simon, On some inequalities for the two-parameter Mittag-Leffler function in the complex plane, 2024. Preprint. arXiv
[61] B. Bauer, S. Gerhold, Self-similar Gaussian Markov processes, 2023. Submitted. arXiv

Refereed publications

[60] B. Bauer, S. Gerhold, The Fan-Taussky-Todd inequalities and the Lumer-Phillips theorem, Journal of Inequalities and Special Functions 14(4), pp. 23-30, 2024. open access
[59] B. Bauer, S. Gerhold, A characterization of real matrix semigroups, Research in Mathematics 11(1), pp. 1-10, 2024. open access
[58] S. Gerhold, Small ball probabilities and and large deviations for grey Brownian motion, Electronic Communications in Probability 28, 1 - 8, 2023. open access
[57] S. Gerhold, T. Simon, A converse to the neo-classical inequality with an application to the Mittag-Leffler function, Monatshefte für Mathematik 200, pp. 627–645, 2023. open access
[56] Ž. Tomovski, S. Gerhold, D. Bansal, A. Soni, Geometric properties of some generalized Mathieu power series inside the unit disk, Axioms 11(10), 568, 2022. open access
[55] Ž. Tomovski, R. Metzler, S. Gerhold, Fractional characteristic functions, and a fractional calculus approach for moments of random variables, Fractional Calculus and Applied Analysis 25, pp. 1307-1323, 2022. open access
[54] S. Gerhold, Ž. Tomovski, Mathieu-Fibonacci series, Journal of Integer Sequences 25(6), Article 22.6.3, 2022. open access
[53] S. Gerhold, F. Hubalek, R. B. Paris, The running maximum of the Cox-Ingersoll-Ross process with some properties of the Kummer function, Journal of Inequalities and Special Functions 13(2), pp. 1-18, 2022. open access
[52] M. Forde, M. Fukasawa, S. Gerhold, B. Smith, The Riemann-Liouville field and its GMC as H→0, and skew flattening for the rough Bergomi model, Statistics and Probability Letters 181, Paper No. 109265, 13 pp., 2022. .pdf
[51] S. Gerhold, A note on large deviations in insurance risk, Applications and Applied Mathematics 16(2), Article 5, 2021. open access
[50] S. Gerhold, C. Gerstenecker, A. Gulisashvili, Large deviations for fractional volatility models with non-Gaussian volatility driver, Stochastic processes and their applications 142, pp. 580-600, 2021. .pdf
[49] S. Gerhold, A. Jacquier, M. Pakkanen, H. Stone, T. Wagenhofer, Pathwise large deviations for the rough Bergomi model: Corrigendum, Journal of Applied Probability 58(3), pp. 849-850, 2021. .pdf
[48] M. Forde, S. Gerhold, B. Smith, Small-time, large-time and H→0 asymptotics for the rough Heston model, Mathematical Finance 31(1), pp. 203-241, 2021. .pdf
[47] S. Gerhold, Asymptotic analysis of a double integral occurring in the rough Bergomi model, Mathematical Communications 25, pp. 171-184, 2020. .pdf
[46] S. Gerhold, F. Hubalek, Ž. Tomovski, Asymptotics of some generalized Mathieu series, Mathematica Scandinavica 126, pp. 424-450, 2020. .pdf
[45] S. Gerhold, A. Pinter, Difference equation theory meets mathematical finance, in: Algorithmic Combinatorics: Enumerative Combinatorics, Special Functions and Computer Algebra, in Honour of Peter Paule on his 60th Birthday, Springer, 2020. .pdf
[44] S. Gerhold, I. C. Gülüm, Consistency of option prices under bid-ask spreads, Mathematical Finance 30(2), pp. 377-402, 2020. open access
[43] S. Gerhold, C. Gerstenecker, Large deviations related to the law of the iterated logarithm for Ito diffusions, Electronic Communications in Probability 25, paper no. 16, 2020. open access
[42] S. Gerhold, C. Gerstenecker, A. Pinter, Moment explosions in the rough Heston model, Decisions in Economics and Finance 42(2), pp. 575-608, 2019. open access
[41] S. Gerhold, Ž. Tomovski, Asymptotic expansion of Mathieu power series and trigonometric Mathieu series, Journal of Mathematical Analysis and Applications 479, pp. 1882-1892, 2019. .pdf
[40] S. Gerhold, I. C. Gülüm, Peacocks nearby: approximating sequences of measures, Stochastic Processes and their Applications 129(7), pp. 2406-2436, 2019. .pdf
[39] S. Gerhold, P. Krühner, Dynamic trading under integer constraints, Finance and Stochastics 22(4), pp. 919-957, 2018. open access
[38] P. Friz, S. Gerhold, A. Pinter, Option Pricing in the Moderate Deviations Regime, Mathematical Finance 28(3), pp. 962-988, 2018. open access
[37] S. Gerhold, I. C. Gülüm, A. Pinter, Small-maturity asymptotics for the at-the-money implied volatility slope in Lévy models, Applied Mathematical Finance 23(2), pp. 135–157, 2016. .pdf
[36] S. Gerhold, M. Kleinert, P. Porkert, M. Shkolnikov, Small time central limit theorems for semimartingales with applications, Stochastics 87(5), pp. 723-746, 2015. .pdf
[35] S. Gerhold, Small-maturity digital options in Lévy models: an analytic approach, Lithuanian Mathematical Journal 55(2), pp. 222-230, 2015. .pdf
[34] S. Gerhold, J. Morgenbesser, A. Zrunek, Refined wing asymptotics for the Merton and Kou jump diffusion models, Banach Center Publ. 104, pp. 85-94, 2015. .pdf
[33] P. Friz, S. Gerhold, Extrapolation analytics for Dupire's local volatility, in: Large Deviations and Asymptotic Methods in Finance (Editors: P. Friz, J. Gatheral, A. Gulisashvili, A. Jacquier, J. Teichmann), Springer Proceedings in Mathematics and Statistics, Vol. 110, 2015. pdf
[32] M. Drmota, S. Gerhold, Disproof of a conjecture by Rademacher on partial fractions, Proc. Amer. Math. Soc. Ser. B 1, pp. 121–134, 2014. .pdf
[31] P. Friz, S. Gerhold, M. Yor, How to make Dupire's local volatility work with jumps, Quantitative Finance 14(8), pp. 1327-1331, 2014. .pdf corrigendum
[30] S. Gerhold, P. Guasoni, J. Muhle-Karbe, W. Schachermayer, Transaction Costs, Trading Volume, and the Liquidity Premium, Finance and Stochastics 18(1), pp. 1-37, 2014. .pdf
[29] S. Altay, S. Gerhold, R. Haidinger, K. Hirhager, Digital double barrier options: Several barrier periods and structure floors, International Journal of Theoretical & Applied Finance 16(8), 14 pages, 2013. .pdf
[28] S. Gerhold, Can there be an explicit formula for implied volatility? Applied Mathematics E-Notes 13, pp. 17-24, 2013. .pdf
[27] S. Gerhold, J. Muhle-Karbe, W. Schachermayer, The dual optimizer for the growth-optimal portfolio under transaction costs, Finance and Stochastics 17, pp. 325-354, 2013. .pdf MathSciNet
[26] S. De Marco, P. Friz, S. Gerhold, Rational shapes of local volatility, Risk, February 2013, pp. 82-87. .pdf
[25] S. Gerhold, J. Muhle-Karbe, W. Schachermayer, Asymptotics and Duality for the Davis and Norman Problem, Stochastics 84(5-6) (The Mark H.A. Davis festschrift), pp. 625-641, 2012. .pdf
[24] S. Gerhold, Asymptotics for a variant of the Mittag-Leffler function, Integral Transforms and Special Functions 23(6), pp. 397-403, 2012. .pdf
[23] S. Gerhold, The Hartman-Watson distribution revisited: asymptotics for pricing Asian options, J. Appl. Probab. 48(3), pp. 892-899, 2011. .pdf
[22] P. Friz, S. Gerhold, A. Gulisashvili, S. Sturm, On Refined Volatility Smile Expansion in the Heston Model, Quantitative Finance 11(8), pp. 1151-1164, 2011. .pdf
[21] S. Gerhold, Counting Finite Languages by Total Word Length, INTEGERS 11, paper no. A44, 2011. .pdf
[20] S. Gerhold, The Longstaff-Schwartz Algorithm for Lévy Models: Results on Fast and Slow Convergence, Annals of Applied Probability 21(2), pp. 589-608, 2011. .pdf
[19] S. Gerhold, Moment Explosion in the LIBOR Market Model, Statistics & Probability Letters 81(5), pp. 560-562, 2011. .pdf
[18] S. Gerhold, M. Zeiner, Convergence Properties of Kemp's q-Binomial Distribution, Sankhya Series A 72(2), pp. 331-343, 2010. .pdf
[17] A. Benoit, F. Chyzak, A. Darrasse, S. Gerhold, M. Mezzarobba, B. Salvy, The Dynamic Dictionary of Mathematical Functions (DDMF), In Komei Fukuda et al., editors, The Third International Congress on Mathematical Software (ICMS 2010), Lecture Notes in Computer Science, vol. 6327, pages 35-41, 2010. .pdf
[16] S. Gerhold, Asymptotic Estimates for Some Number Theoretic Power Series, Acta Arithmetica 142(2), pp. 187-196, 2010. .pdf
[15] S. Gerhold, Unimodality of Two Distributions Related to the Negative Binomial Distribution, Journal of Statistical Theory and Applications 9(1), pp. 1-7, 2010. .pdf
[14] S. Gerhold, U. Schmock, R. Warnung, A Generalization of Panjer's Recursion and Numerically Stable Risk Aggregation, Finance and Stochastics 14, pp. 81-128, 2010. .pdf; slightly corrected version; slides by Uwe Schmock
[13] P. Flajolet, S. Gerhold, B. Salvy, Lindelöf Representations and (Non-)Holonomic Sequences, Electronic Journal of Combinatorics 17(1), 2010. .pdf
[12] S. Gerhold, The Shape of the Value Sets of Linear Recurrence Sequences, Journal of Integer Sequences 12, 2009. .pdf
[11] S. Gerhold, Asymptotic Analysis of Some Discrete Distributions by the Saddle Point Method, Comm. Statist. Theory Methods 38(2), pp. 262-271, 2009. .pdf
[10] S. Gerhold, R. Warnung, Finding Efficient Recursions for Risk Aggregation by Computer Algebra, Journal of Computational and Applied Mathematics 223, pp. 499-507, 2009. .pdf
[9] J.P. Bell, S. Gerhold, M. Klazar, F. Luca, Non-Holonomicity of Sequences defined via Elementary Functions, Annals of Combinatorics 12(1), pp. 1-16, 2008. .pdf
[8] S. Gerhold, L. Glebsky, C. Schneider, H. Weiss, B. Zimmermann, Computing the complexity for Schelling segregation models, Communications in Nonlinear Science and Numerical Simulation 13(10), pp. 2236-2245, 2008. .pdf
[7] H. Alzer, S. Gerhold, M. Kauers, A. Lupas, On Turán's Inequality for Legendre Polynomials, Expo. Math. 25(2), pp. 181-186, 2007. .pdf
[6] J.P. Bell, S. Gerhold, On the Positivity Set of a Linear Recurrence Sequence, Israel J. Math. 157, pp. 333-345, 2007. .pdf
[5] S. Gerhold, M. Kauers, A Computer Proof of Turán's Inequality, Journal of Inequalities in Pure and Applied Mathematics 7(2), 2006. .pdf .bib
[4] P. Flajolet, S. Gerhold, B. Salvy, On the non-holonomic character of logarithms, powers and the nth prime function, Electronic Journal of Combinatorics 11(2), 2005. .pdf .bib
[3] S. Gerhold, M. Kauers, A Procedure for Proving Special Function Inequalities Involving a Discrete Parameter, Proceedings of ISSAC '05, M. Kauers (ed.), ACM Press, pp. 156-162, 2005. .pdf .ps .bib
[2] S. Gerhold, Point Lattices and Oscillating Recurrence Sequences, Journal of Difference Equations and Applications 11(6), pp. 515-533, 2005. .pdf .bib
[1] S. Gerhold, On Some Non-Holonomic Sequences, Electronic Journal of Combinatorics 11(1), 2004. .pdf .bib

Book

[1] Ž. Tomovski, D. Leškovski, S. Gerhold, Generalized Mathieu Series, Springer, 2021.

Book chapters

[2] S. Gerhold, A. Jacquier, M. Rosenbaum, Rough Heston, book chapter in: C. Bayer, P. Friz, M. Fukasawa, J. Gatheral, A. Jacquier, M. Rosenbaum (Eds.), Rough Volatility. SIAM, 2023.
[1] S. Gerhold, M. Kauers, C. Koutschan, P. Paule, C. Schneider, B. Zimmermann, Computer-Assisted Proofs of Some Identities for Bessel Functions of Fractional Order, book chapter in: Schneider, Blümlein (Eds.), Computer Algebra in Quantum Field Theory: Integration, Summation and Special Functions. Springer, 2013. arXiv Springer

Lecture notes

[1] Skriptum Personenversicherungsmathematik .pdf

Theses

[3] S. Gerhold, Special Functions: From Lindelöf Integrals to Volatility Smiles, habilitation thesis, Vienna University of Technology, 2011. slides
[2] S. Gerhold, Combinatorial Sequences: Non-Holonomicity and Inequalities, Ph.D. thesis, J. Kepler University Linz, 2005. .pdf .bib
[1] S. Gerhold, Uncoupling Systems of Linear Ore Operator Equations, diploma thesis, J. Kepler University Linz, 2002. .pdf .ps .bib citations in physics papers

Coauthors

So far I have had the pleasure to collaborate with the following 58 people. My Erdős number is 2, thanks to my coauthor Florian Luca.

Sühan Altay, Horst Alzer, Deepak Bansal, Benedict Bauer, Jason Bell, Alexandre Benoit, Frédéric Chyzak, Alexis Darrasse, Stefano De Marco, Michael Drmota, Paul Eisenberg, Philippe Flajolet †, Martin Forde, Peter Friz, Masaaki Fukasawa, Lev Glebsky, Christoph Gerstenecker, Paolo Guasoni, Archil Gulisashvili, I. Cetin Gülüm, Rainer Haidinger, Karin Hirhager, Friedrich Hubalek, Antoine Jacquier, Manuel Kauers, Martin Klazar, Maximilian Kleinert, Christoph Koutschan, Delčo Leškovski, Florian Luca, Alexandru Lupas †, Ralf Metzler, Marc Mezzarobba, Johannes Morgenbesser, Johannes Muhle-Karbe, Mikko Pakkanen, Richard B. Paris †, Peter Paule, Arpad Pinter, Piet Porkert, Bruno Salvy, Walter Schachermayer, Uwe Schmock, Carsten Schneider, Mykhaylo Shkolnikov, Thomas Simon, Benjamin Smith, Amit Soni, Henry Stone, Stephan Sturm, Živorad Tomovski, Richard Warnung, Marc Yor †, Thomas Wagenhofer, Howie Weiss, Martin Zeiner, Burkhard Zimmermann, Axel Zrunek

Selected talks

Fractional models in financial option pricing, Nov 28, 2023. Lorentz Center workshop: Fractional Differential Equations, Applications and Complex Networks, Leiden.
Fractional asset price models from econophysics, May 22, 2023. Workshop "Volatility is rough, so now what?", Isle of Skye.
On the non-Markov property: Gaussian processes and beyond, June 28, 2022. Advances in Mathematical Finance and Optimal Transport, Pisa.
Asymptotic pricing of VIX options under rough volatility, Sep 28, 2021. ÖMG - DMV 2021, Passau (online talk).
Small-time and large-time smile behaviour for the rough Heston model, Jul 8, 2019. ICCF 2019, A Coruña.
Moment Explosions in the Rough Heston Model, Mar 15, 2018. Mathematical finance and related issues, Osaka.
Dynamic trading under integer constraints, Sep 14, 2017. ÖMG - DMV 2017, Salzburg.
Consistency of option prices under bid-ask spreads, Feb 27, 2017. Mathematics of quantitative finance, Oberwolfach.
Option pricing in the moderate deviations regime, July 2016. 9th World Congress of the Bachelier Finance Society, NYC. .pdf
Small-maturity options in the moderate regime, Sep 2015. Joint Austrian-Hungarian Mathematical Conference, Győr.
Utility maximization and symbolic computation, Jun 3, 2015. 13th International Symposium on Orthogonal Polynomials, Special Functions & Applications, NIST, Gaithersburg.
The Small-Maturity Implied Volatility Slope for Lévy Models, Nov 14, 2014. SIAM Conference on Financial Mathematics & Engineering, Chicago.
From Kellerer's Theorem to Local Volatility Models, Oct 31, 2014. Séminaire Bachelier, Paris.
The Small-Maturity Implied Volatility Slope for Lévy Models, Jun 5, 2014. Eighth World Congress of the Bachelier Finance Society, Brussels. .pdf
Disproof of a conjecture by Rademacher on partial fractions, Apr 2, 2014. Mathematisches Kolloquium, Universität Wien. .pdf
Disproof of a conjecture by Rademacher on partial fractions, Jan 8, 2014. Algorithmic combinatorics seminar, RISC, JKU Linz.
Local Volatility Models: Approximation and Regularization, Jun 11, 2013. Advances in Mathematics of Finance - 6th General AMaMeF and Banach Center Conference, Warsaw. .pdf
Local volatility asymptotics and small-time central limit theorems, Apr 9, 2013. Workshop on Large deviations and asymptotic methods in finance, Imperial College London. .pdf
Small time central limit theorems for semimartingales with applications, Feb 13, 2013. Seminar talk at TU Berlin. .pdf
Some traces of discrete mathematics in mathematical finance, Jan 29, 2013. Invited colloquium talk at the Arbeitsgemeinschaft Diskrete Mathematik, Vienna University of Technology, Austria. .pdf
Extrapolation analytics for Dupire's local volatility, July 6, 2012. 6th European Congress of Mathematics, Krakow. .pdf
Don't stay local - extrapolation analytics for Dupire's local volatility, June 21, 2012. Seventh World Congress of the Bachelier Finance Society, Sydney.
Utility maximization under transaction costs, May 30, 2012. 12th Viennese Workshop on Optimal Control, Dynamic Games and Nonlinear Dynamics (OCDGND).
Transaction costs, trading volume, and the liquidity premium, Mar 8, 2012. Stochastiktage Mainz 2012. .pdf
Transaction costs, trading volume, and the liquidity premium, Feb 3, 2012. Nomura seminar, University of Oxford.
Transaction costs made tractable, Dec 14, 2011. QMF 2011, Sydney.
On Refined Volatility Smile Expansion In The Heston Model, July 21, 2011. ICIAM 2011, Vancouver. .pdf
Special Functions: From Lindelöf Integrals to Volatility Smiles, June 28, 2011. Habilitationskolloquium, TU Wien. .pdf
On Refined Volatility Smile Expansion In The Heston Model, June 26, 2010. Sixth World Congress of the Bachelier Finance Society, Toronto. .pdf
Lindelöf integral representations and asymptotic analysis of a certain power series with closed-form coefficients, January 20, 2009. Colloquium talk at the Arbeitsgemeinschaft Diskrete Mathematik, Vienna University of Technology, Austria. .pdf
Lévy-Sheffer Systems and the Longstaff-Schwartz Algorithm for American Option Pricing, October 18, 2008. Invited talk at the Conference on Numerical Methods for American and Bermudan Options, Wolfgang Pauli Institute, Vienna (Austria). .pdf
On a Certain Functional Equation: Oscillations in the Solutions and Their Taylor Coefficients, September 8, 2008. Invited colloquium talk at INRIA Rocquencourt, France. .pdf
The Sign Structure of Linear Recurrence Sequences, Apr 1, 2007. Invited talk at Progress on Difference Equations 2007, Laufen, Germany. .pdf
Automatisches Beweisen von Identitäten, Oct 30, 2006. Colloquium talk, Wissenswertes aus der Mathematik, Vienna University of Technology, Austria. .pdf
An Implementation of the LIBOR Market Model for Pricing Exotic Constant Maturity Swaps, Sep 26, 2006. Invited talk at PRisMa 2006, Vienna University of Technology, Austria.
An Implementation of the LIBOR Market Model, Aug 30, 2006. Seminar talk at the Research Unit of Financial and Actuarial Mathematics, Vienna University of Technology, Austria.
Crashcourse Interest Rate Models, Aug 30, 2006. Seminar talk at the Research Unit of Financial and Actuarial Mathematics, Vienna University of Technology, Austria. .pdf
Non-Holonomic Sequences and Functions, May 16, 2006. Invited colloquium talk at the Arbeitsgemeinschaft Diskrete Mathematik, Vienna University of Technology, Austria. .pdf
Special Functions: Applications of Computer Algebra in Stochastics, May 4, 2006. Colloquium talk at Johann Radon Institute for Computational and Applied Mathematics, Linz, Austria.
Special Functions: Applications of Computer Algebra in Stochastics, January 10, 2006. Invited colloquium talk at Vienna University of Technology, Austria. .pdf
Recurrence Relations and Inequalities, November 14, 2005. Invited colloquium talk at INRIA Rocquencourt, France. .pdf
Positivity of P-Recursive Sequences, October 11, 2004. Contributed talk at Séminaire Lotharingien de Combinatoire, Ellwangen, Germany.