Robert Recorde, The designer ofwel the equals sign, introduced plus and minus to Britain in 1557 in The Whetstone of Witte:[14] "There be other twee signes in often use of which the first is made thus + and betokeneth more: the other kan zijn thus made − and betokeneth lesse." https://wastedish2.bravejournal.net/hoeveel-u-moet-verwachten-u-betaalt-voor-een-goede-wrapfolie-hexis