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 2 signes in often use ofwel which the first is made thus + and betokeneth more: the other is thus made − and betokeneth lesse." Les https://bojsen-wade.hubstack.net/hoeveel-u-moet-verwachten-u-betaalt-voor-een-goede-wrapfolie-hexis