

The Ottoman Mosque Fallacy: Places of Worship Facing the Kaaba or “Monuments of Jihad”?
by David A King

How Mathematics Created Civilisation: Bestselling science writer Michael Brooks takes us on a fascinating journey through the history of civilisation, as he explains why maths is fundamental to our understanding of the world.
“Mathematics in Africa has been written out of history books – it’s time we reminded the world of its rich past” Michael Brooks
When we learn the history of mathematics, we tend to learn about the achievements of Greek, Hindu, Chinese and Arabic civilisations. If we learn anything about African mathematics, it’s almost entirely about Egypt. But sub-Saharan Africa has a rich mathematical history too – and it is possible that the world’s museums hold the key to bringing it back to life.
Sub-Saharan Africa has largely been written out of the history of mathematics because many of its traditions were passed down by word of mouth and then lost because of disruptive events such as the slave trade. It also suited Europeans to spread the idea that the peoples that they had captured and enslaved were not intelligent in any meaningful way. But the records we do have, some written, and some bound up in historical artefacts that give a glimpse of daily life, tell us those complex mathematics was always central to the activities of African civilisations, just as it always has been to civilisations in other regions of the world.
Some of the evidence comes from those who were in contact with slaves and slavers. European captains of slave-trading ships, for instance, marvelled at the mathematical abilities of the African traders they encountered. Sailors who made bargains with African slave dealers described them as “sharp arithmeticians” who could skillfully convert currencies and exchange rates in their heads. According to one account, a broker might have 10 slaves to sell:
“and for each of these he demands 10 different articles. He reduces them immediately by the head into bars, coppers, ounces, according to the medium of exchange that prevails in the part of the country in which he resides, and immediately strikes the balance”.
That shouldn’t surprise us when we look at the number system used in the Yoruba language spoken in what is now Nigeria. The phrase for “forty-five” translates as “take five and 10 from three twenties”. It might sound cumbersome, but it is a sign of people being comfortable with subtraction and multiplication. The Yoruba started esusu too. Records of complex financial systems in pre-colonial Nigeria – banks and mutual societies, effectively – suggest that dealing with complicated accounts, loans, credits and debits was just part of everyday life. These were not people who were uncomfortable with mathematics
It is also impossible to quantify how much these losses impacted the reputation of African mathematics and contributed to 19th- and 20th-century notions of the intellectual inferiority of the African people. However, we are slowly regaining a better perspective…
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