This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
William Kingdon Clifford . William Kingdon Clifford William Kingdon Clifford dcs stand ac uk html School of Mathematics and Statistics University of St Andrews Scotland Transferred from org hu transferred to Commons by User Beroesz using de php CommonsHelper tmozgatva Beroesz ltal org Magyar de php CommonsHelper hasznlatval