In a work of this scope, the author of the book is not to be faulted that there may be some disagreement with occasional facts. Make comment on this entry Gerdes, Paulus. On mathematics in the history of sub-Saharan Africa. He also discusses related areas, such as technology, and studies on language and mathematical concepts. A goal of the studies mentioned is apparently to better understand mathematics learning in Africa.
Some studies focus on logic.
Questions on interaction with ancient Egypt are still largely open. A better understanding of Islamic mathematics in sub-Saharan Africa is desirable as well. Includes an extensive bibliography. Make comment on this entry Seidenberg, A. and Casey, J. The ritual origin of the balance. The authors note that in ancient Egypt, one's heart was believed to be weighed against a feather in order to decide whether one would be able to enter the afterlife.