21 volumes for the 21st century
摘要
This is the traditional triennial note used by the Editors to give the readers of 4OR information on the state of the journal and its future. In the three years that have passed since the last editorial note (Crama et al. in 4OR, 19:1–13, 2021), three volumes (each containing four issues) of the journal have been published: vol. 19 (2021), vol. 20 (2022), and vol. 21 (2023).