@johncarlosbaez in French it's even worse than in English. It's the same word for his and her. In fact it's "son" in both cases if the possessed object's name is masculine and "sa" if it's feminine (names have a gender without any reason except what the dictionary says).

@johncarlosbaez I thought Bogolyubov solved this problem. I may be wrong, perhaps I misunderstood Bogolyubov's work?

@BartoszMilewski It's possible, but I think that doesn't explain everything—for example, the exhilarating feeling one experiences when contemplating a mountain landscape, with slopes stretching for miles beyond a valley, and why we find it infinitely more beautiful than a landscape of steppe."

@BartoszMilewski So, René Descartes was not rational?