Some multifaceted aspects of mathematical physics, our common denominator with Elliott Lieb

Mathematical physics has many facets, of which we shall briefly give a (very partial) description, centered around those of main interest for Elliott and us (Moshe Flato and I). In our case these aspects had as a corollary a variety of "parascientific activities", in particular the foundation of IAMP (the International Association of Mathematical Physics) and of the journal LMP (Letters in Mathematical Physics), both of which were strongly impacted by Elliott, and Elliott's long insistence that publishers do not demand "copyright transfer" as a precondition for publication but are satisfied with "consent to publish", which is increasingly becoming standard. Since this article is testimony to the huge scientific impact of Elliott, the latter intertwined aspects constitute the core of the present contribution. The last part deals briefly with metaphysical and metamathematical considerations related to axioms.
Comment: 12 pages, third version (October 2022) of our paper dedicated to our friend Elliott Lieb on the occasion of the ninetieth anniversary of his birth. Some additions in the first two sections, a new "metamathematical" Section 3, and journal reference added