Geschiedenis van de kant van wie het overkwam
Mathematics
| Year | Country | Category | title |
|---|---|---|---|
| 7 April 1921 | Nigeria | Mathematics | Chike Obi is born |
| 7 April 1921 | Nigeria | Mathematics | Obi proves results on periodic solutions |
| 7 April 1921 | Nigeria | Mathematics | A Nigerian mathematician builds postcolonial higher education |
| 7 April 1921 | Nigeria | Mathematics | Obi connects mathematics with political life |