Dr Richard Price's maths legacy, 250 years on A US expert says a Welsh clergyman and amateur mathematician should be more widely recognised for his work on a vital probability equation still in use today. Dr Richard Price redrafted the work of Rev Thomas Bayes - and had the work published in 1763 after Bayes death. It contained what is known as Bayes rule - an equation on probability that permeates the modern world, from internet search engines to financial calculations. It was also key to cracking codes in World War II. But Sharon Bertsch McGrayne argues that is should be known as the Bayes-Price rule - because without the work of the minister from Llangeinor near Bridgend - the theorem would not have been published. She told Vaughan Roderick on BBC Radio Wales' Sunday Supplement programme why Dr Price was such an important figure. US founders influenced by Welshman