@freemo @mandlebro I would suggest the writer's talent is with numbers and concepts, not clearly with words.
Sadly, as someone who wants to communicate his thoughts, and specially on a teaching text, should do better.
I remember a dreadful Calculus book, by Moise, which I hated, absolutely.
@mandlebro @freemo Ah, thank you for the clarification! 😉
@design_RG @freemo I should comment that this is not book that is meant to be read by anyone other than mathematicians. Its an AMS monograph on a modern theory that started being developed, I think, in the 80's, namely information geometry. It's also, as far as I know, the first text on the topic. This line was just laughably convoluted for what he was trying to say.