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 is made thus + and betokeneth more: the other is thus made − and betokeneth lesse." Voor https://telegra.ph/Hoeveel-u-moet-verwachten-u-betaalt-voor-een-goede-monteren-wrapfolie-05-29