This essay recounts the story of the quest for equational axiomatizations of parallel composition operators in process description languages, and of similar results in the classic field of formal language theory. Some of the outstanding open problems are also mentioned. © 2006 Elsevier B.V. All rights reserved.
Aceto, L., & Fokkink, W. (2006). The Quest for Equational Axiomatizations of Parallel Composition: Status and Open Problems. Electronic Notes in Theoretical Computer Science, 162(1), 43–48. https://doi.org/10.1016/j.entcs.2005.12.076