André Lichnérowicz,
known as
"Lichné"
He passed away several years ago. A man one cannot forget. A prince of mathematics, warm, open-minded, refined, always ready to encourage young researchers. This portrait will amuse those who knew him well, as it is strikingly similar—both in the accuracy of the features and in the posture. That was precisely the attitude Lichné had when listening to you.
A member of the Academy of Sciences, he was widely known around the world for his work in differential geometry. He did his best to help negotiate Souriau’s admission to the Academy of Sciences, but in vain. It was a pity, because his presence would have greatly enriched this assembly, which still includes quite a few dinosaurs.
Thanks to him, I was able to publish my first works on "twin cosmology" in 1977.