Robert Recorde, The designer ofwel the equals sign, introduced plus and minus to Britain in 1557 in The Whetstone ofwel Witte:[14] "There be other twee signes in often use of which the first kan zijn made thus + and betokeneth more: the other kan zijn thus made − and betokeneth https://cuwip.ucsd.edu/members/lycraclick8/activity/486308/