Is an interesting read, but it's striking how condescending he is at the outset. How about let the reader decide what they understand or not? There's no use in saying anything regarding that.
His sister had evidentially asked him about his work (maybe to give him something positive to talk about given that he was in prison).
"Some thoughts I have had of late, concerning my arithmetic-algebraic work, might pass for a re- sponse to one of your letters, where you asked me what is of interest to me in my work. So, I decided to write them down, even if for the most part they are incomprehensible to you."
It might seem condescending to speak to his sister like this, but perhaps he understood her intent well enough, and was essentially acknowledging it.
Basically he is saying, let me document this for myself, at the appreciated behest of sis.
Tell me you live in the information age without telling me you live in the information age
as well as their anglicisms, mdr:
> ... il avait aussi un theorema egregium, et je ne sais plus which is which.
(wait, did M Polnareff invent the lyric video here?)
I'd have guessed he invented Boggle, the intertubes have that at 1972, 18 years earlier.
I have no words for the French here in '67: https://www.youtube.com/watch?v=3LZbw6YCcm4
(Les Horribles Cernettes lineup appears to have been far more anglophone than francophone over the years, but all of them —as it was a founding member in 1954– have at least tenuous ties to belgium)
https://images.computerhistory.org/revonline/images/50000487...