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| Friday 19 May 2006: The equal sign |
| The equal sign '=' was invented by 16th Century Welsh mathematician Robert Recorde. In his book "The Whetstone of Witte" on algebra he confesses in 1557 that he was fed up with writing "is equal to" in his equations. He chose the two lines "bicause noe .2., thynges can be moare equalle". |