Johann Rahn, Date of Birth, Place of Birth, Date of Death
TweetJohann Rahn
mathematician (1622-1676)
Date of Birth: 10-Mar-1622
Place of Birth: Töss, canton of Zürich, Switzerland
Date of Death: 27-May-1676
Profession: mathematician
Nationality: Switzerland
Zodiac Sign: Pisces 
About Johann Rahn
- Johann Rahn (Latinised form Rhonius) (10 March 1622 – 25 May 1676) was a Swiss mathematician who is credited with the first use of the division symbol, ÷ (obelus) and the therefore sign, ?.
- The symbols were used in Teutsche Algebra, published in 1659.
- John Pell collaborated with Rahn in this book, which contains an example of the Pell equation.
- It is uncertain whether Rahn or Pell was responsible for introducing the symbols.
- Rahn was also, it seems, mayor of the city of Zurich in 1655.
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