The '=' (equals) sign, invented by the #Welsh physician and mathematician Robert Recorde, is said to have been used for the very first time #onthisday 1557 https://t.co/kWcmc31hVK #WelshHistory #Wales pic.twitter.com/ZJZ64g0OhP— Welsh Biography (@WelshBiography) July 10, 2020
No comments:
Post a Comment