The title of the questions says it all. I am asking this since I noticed that all questions and answers to which I contributed, fully citing sources with their MR and/or Zbl reviews as it is my custom to do so, have all been tracked back inside the relevant zbMATH Open reviews except for this lat...

The Wikipedia article on Hahn Series mentions that these were studied by Hahn "in his approach to Hilbert's seventeenth problem". Is this correct? If so, what was this approach, and where can I read about it? I have read most of Hahn's paper über die nichtarchimedischen Größensysteme, where...

Something almost unmissable, for those who can read Italian: Francesco Giacomo Tricomi, La mia vita di matematico attraverso la cronistoria dei miei lavori. (Bibliografia commentata 1916–1967), Padova: CEDAM – Casa Editrice Dottor Antonio Milani, pp. XII+172 (1967), MR0274255, Zbl 0199.28603. My...

This is well beyond my expertise, but I just learned some of the history behind $u$-invariants of fields $F$, where ($u(F)+1$)-variable quadratic equations always have a non-trivial solution, but $u(F)$-variable equations may not. Here is the Wikipedia explanation. In particular, although it seem...

Why Charles Bradfield Morrey, Jr.'s "Collected works" haven't been published yet? I've been thinking of this question for a while, at least from the first time I started to improve the Wikipedia entry on him: I saw an advertising on this book on the back of the front page of the book [1] (as show...

This is more a long comment than an answer, but I know that a similar problem, also originated from (macromolecular) biology, was studied and solved by Gaetano Fichera, Maria Adelaide Sneider and Jeffreys Wyman. The system of ODEs they studied was the following one $$ \left\{ \begin{split} x_1' &...

Disclaimer. This answer stems from a draft of an entry on the symbol of a singular integral operator I am writing for the Wikipedia, thus it is by no means complete. From the sources I have read until now (for example Gaetano Fichera's papers [1], p. 475 and [2], pp. 52-54 and Vladimir Maz'ya's b...

In the books [1], pp. 41-42 and [2], p. 67, it is stated that his name (and patronymic) is Mikhail Mikhailovich, confirming Anatoly Kochubei's comment to Kostya_I's answer. References also state that he was born on the 26 of April 1910 in Moscow, laureated from (the then called) Leningrad Univers...

This is really not my expertise: however, some friends and knowledgeable researchers in these fields have shared with me some insight, so I can add my two cents by sharing with you what they shared with me. The differential and integral calculus for algebras of functions over bicomplex numbers wa...