Arnie was a good friend of mine. His work is directly related to the universal logic project: https://www.logica-universalis.org/ He was keynote speaker at the first UNILOG in Montreux in 2005. Later I visited him at CUNY. His main work is based on Paul Hertz's idea of Satzsysteme, from which the work of Gentzen is derived. See: "A Structuralist Theory of Logic", Cambridge University Press, New York, 1992. https://philpapers.org/rec/KOSAST-2 and the first chapter of: "Universal Logic: An Anthology, From Paul Hertz to Dov Gabbay" https://link.springer.com/book/9783034601443 JYB
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