Photo of Professors Colm Mulcahy (Spelman College) and Tony O’Farrell (Maynooth University) at the annual Hamilton Walk, on 16 October 2015,¬†at Broome Bridge on the Royal Canal, Dublin. Behind them is a commemorative plaque of WR Hamilton’s discovery of quaternions on that date in 1843 (and a recent portrait of WRH. For now, the purpose … More Mathematics