Both the authors and I are discussing evolution. You seem to think there is some significant difference between cultural evolution and DNA evolution in this context—but I don’t agree that that is correct. If you can have multiple parents in DNA evolution, you can have multiple parents in cultural evolution—and visa versa. IOW, there’s nothing special or magical about DNA as a medium of inheritance. It’s a storage medium, like any other.
Anyway, despite their section titles, the authors don’t claim that you can’t have multiple parents in real evolution. They are only talking about their toy model—which, incidentally has practically nothing to do with how or why sex evolved, AFAICS.
The paper doesn’t define evolution.
Both the authors and I are discussing evolution. You seem to think there is some significant difference between cultural evolution and DNA evolution in this context—but I don’t agree that that is correct. If you can have multiple parents in DNA evolution, you can have multiple parents in cultural evolution—and visa versa. IOW, there’s nothing special or magical about DNA as a medium of inheritance. It’s a storage medium, like any other.
Anyway, despite their section titles, the authors don’t claim that you can’t have multiple parents in real evolution. They are only talking about their toy model—which, incidentally has practically nothing to do with how or why sex evolved, AFAICS.