- Universität Hildesheim ›
- Mathematik, Naturwissenschaften, Wirtschaft & Informatik ›
- Institute ›
- Institut für Mathematik & Angewandte Informatik ›
- Forschung und Projekte ›
- Schriftenreihe "Geschichte der Mathematik" ›
- Jahrestagung Mathematikgeschichte und Unterricht ›
- Digitaler Geschichtstag 2021 ›
- Staffan Rodhe (Uppsala Universitet)
Staffan Rodhe (Uppsala Universitet)
A symbol for continuous proportionality
I first met the symbol while working with Emanuel Swedenborg's mathematical manuscripts and then in his book on Algebra, Regelkonsten. A more detailed use of the symbol is presented in Daedalus Hyperboreus, the first Swedish scientific journal, edited by Swedenborg in 1716 - 1718. Later I found the symbol in William Oughtred's and William Jones's texts printed in 1647 and 1706. These observations let me dare to give a talk on this forgotten symbol.