I do not think that Les Furtifs is available in English yet…

As for Mathematica, yes it is about the Mathematic however at a personal development level. David Bessis tries to explain that people’s brain is compatible with the mathenathic. Some people wrongly think that they are bad at this because nobody taught them how to do. For him abstraction is something that need to be trained. An example is that each one of us can easily imagine (to watch in our head) a perfect circle even if it does not exist in our reality. The author explains that to do Math is to learn to fail, to make mistakes, to correct our intuition.