Over the course of my career, I wrote a few papers and books (and several hundred blog posts), some with other people and some on my own.
Technical books
- with Bartłomiej Przybylski: LaTeX. Książka kucharska (“LaTeX: A Cookbook”, unrelated to another book with a similar title), Polish Mathematical Society (PTM), 2015. This is a textbook on LaTeX, a document preparation system, containing numerous examples and ready-to-use recipes.
- Hacking Your Way Around in Emacs, Leanpub, 2021. This is an intermediate textbook on Emacs Lisp, the language in which GNU Emacs is written and can be extended, organized as a series of three production-grade utility commands built step-by-step with detailed explanations.
- Personal Accounting in Ledger, Leanpub, 2023. This is a booklet explaining the principles of double-entry accounting, focused on personal/home accounting and using Ledger (a plain text accounting program) for examples.
Mathematical books
- Theory of Hyperconvex Metric Spaces: A Beginner's Guide, Lecture Notes in Nonlinear Analysis, vol. 14, Juliusz Schauder Centre for Nonlinear Studies, Nicolaus Copernicus University, Toruń, 2015. This is a 100-page introduction to the theory of hyperconvex metric spaces, focused on fixed point theory.
- with Bugajewska and Kasprzak: Selected Topics in Nonlinear Analysis, Lecture Notes in Nonlinear Analysis, vol. 19, Juliusz Schauder Centre for Nonlinear Studies, Nicolaus Copernicus University, Toruń, 2021. This is an almost 500-page volume covering several topics in nonlinear functional analysis (measures of non-compactness, fixed point theory, hyperconvex metric spaces, almost periodic functions and functions of bounded variation) in depth (including recent results).
Mathematical papers
(These are of interest mainly for specialists, but I include them here for completeness.)
- with Bugajewski and Przybycień: Hyperconvex spaces revisited, Bulletin of the Australian Mathematical Society, 2003. doi:10.1017/S0004972700037588
- with Bugajewski and Przybycień: Some remarks on hyperconvex metric spaces and the small ball property, Proceedings of the Sixth Conference Function Spaces (World Scientific Publishing), 2003. zbMath
- A Krasnoselskii-type fixed point theorem for multifunctions defined on a hyperconvex space, Int. J. Evol. Equ. 2, 2007. zbMath
- with Bugajewski: On fixed point theorems of Leray-Schauder type, Proceedings of the American Mathematical Society, 2008. doi:10.1090/S0002-9939-07-09023-5
- with Bugajewski and Zima: On some fixed point theorems for generalized contractions and their perturbations, Journal of Mathematical Analysis and Applications, 2010. doi:10.1016/j.jmaa.2010.01.073
- with Bugajewski and Phulara: On some properties of hyperconvex spaces, Fixed Point Theory and Applications, 2010. doi:10.1155/2010/213812
- with Maćkowiak: Further remarks on formal power series, Commentat. Math. Univ. Carol., 2012. zbMath
- with Bugajewski and Burchardt: On topological properties of metrics defined via generalized “linking construction”, Journal of Function Spaces, 2017. doi:10.1155/2017/4901762
- with Bugajewska: Applications of Henstock-Kurzweil integrals on an unbounded interval to differential and integral equations, Mathematica Slovaca, 2018. doi:10.1515/ms-2017-0082
Blog
Of course, I’m also a prolific blogger, with at least one post per week since 2014 (and a second, no longer active blog which ran from 2023 to 2025).