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.

Answers distribution

in 1555
in 1666
in 1777
in 1888
answers
flagGermany
0%
25%
56%
18%
16
flagUnknown
9%
25%
42%
22%
178
flagPoland
8%
25%
40%
25%
1715
flagthe United Kingdom
0%
21%
39%
39%
28

Gender

men41%
women42%
in 1555
7%
7%
in 1666
23%
21%
in 1777
41%
42%
in 1888
27%
28%

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In which year did Leonhard Euler introduced the symbol "i" to represent the square root of -1 ?
18
55%

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