The Tudor Society

June 18 – The inventor of the = sign

On this day in Tudor history, 18th June 1558, the will of Welsh mathematician, physician and mint administrator Robert Recorde was proved.

Robert Recorde was the inventor of the "=" sign and wrote books on mathematics. Interestingly, he also wrote a urological treatise "The Urinal of Physick".

Find out more about him...

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June 18 – The inventor of the = sign