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Johann Heinrich Rahn (also known as Hans Heinrich Rahn and Johann Rahn; 10 March 1622 - 27 May 1676) was a Swiss mathematician who is credited with the first use of the division sign, ÷ (a repurposed obelus variant) and the therefore sign, ?. The symbols were used in Teutsche Algebra, published in 1659. John Pell collaborated

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