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 ofwel which the first kan zijn made thus + and betokeneth more: the other kan zijn thus made − and betokeneth https://holland-oneill-3.federatedjournals.com/bekijk-dit-rapport-over-3mvhb-primer-en-wrapfolie