This is the accepted version.
added by Tschuka Dec. 29, 2017, 12:31 p.m.
+1: Very interesting!  Marcel
+1: Very interesting!  Fabi
+1: Acceptable  Kamp
In which year did Leonhard Euler introduced the symbol "i" to represent the square root of -1 ?
in 1555
in 1666
in 1777
in 1888
The letter "i" as a designation of the element from -1 was proposed by Leonhard Euler in 1777. Later, from 1801, this designation was popularized by Carl Friedrich Gauss. Currently, it is the most commonly used symbol of the imaginary unit.
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