Does anyone know anything about M. Meyniel? [According to zbMath](https://www.zbmath.org/authors/?q=ai%3Ameyniel.m), he published precisely one mathematics paper, in which he gave a sufficient condition for hamiltonicity of digraphs:



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> "[Une condition suffisante d'existence d'un circuit hamiltonien dans un graphe oriente](https://doi.org/10.1016/0095-8956(73)90057-9)" (*JCTB* **14** (1973), 137–147).
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In that paper, he was listed with an address but no affiliation. The address was 13, rue Poirier de Narçay, Paris 14ᵉ, which appears to be an apartment above a [game store](https://www.games-workshop.com/de-AT/Warhammer-Paris-14e?_requestid=11221417) for what it is worth.


I assume that M. Meyniel is distinct from Henri Meyniel of [Meyniel graphs](https://en.wikipedia.org/wiki/Meyniel_graph) and [Meyniel's conjecture](https://en.wikipedia.org/wiki/Cop_number#General_results). That said, the paper "[Sufficient conditions for a digraph to be Hamiltonian](https://doi.org/10.1002/(SICI)1097-0118(199606)22:2%3C181::AID-JGT9%3E3.0.CO;2-J)" (*J. Graph Th.* **22** (1996) 181–187) is dedicated to the memory of Henri Meyniel and lists Henri Meyniel as the author of M. Meyniel's paper (item [15] in the bibliography).



Who is M. Meyniel?
You can be quite sure that M. Meyniel means "Monsieur Meyniel" (a common usage in French).


Here is what I think is definite proof that M. Meyniel is H. Meyniel: The acknowledgement of the 1973 paper by M. Meyniel thanks J.C. Bermond, so evidently Bermond knew the author. In the article [Cycles in digraphs - a survey](https://hal.inria.fr/hal-02424283/file/44-BeTh81-surveycyclesdigraphs.pdf) Bermond and Thomassen cite the 1973 paper as follows:



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> Meyniel, H., Une condition suffisante d'existance d'un circuit hamiltonien dans un graphe orienté, *J. Combinatorial Theory B* 14(1937), 137–147
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