Mathematical Foundations of Modeling ETL Process Chains. - Levin Maier; Lucas Schulze; Robert Lilow; Lukas Hahn; Nikola Krasowski; Arnulf Barth; Sebastian Gaebel; Ferdi Güran; Oliver Hanau; Giovanni Wagner; Falk Borgmann; Oleg Arenz; et al. (CoRR, 2026)