which mathematicians are known for first using the following symbols ...i,e,! and ±
Euler is very famous for inventing new mathematical symbols and identities.
Euler invented e, in the year 1736.
Euler also invented i, which was invented in 1777.
Ch. Kramp invented !, in the year 1808.
German mathematician invented the ± symbol, although it wasn't clear when.
If you want to learn more about symbols, visit this website: https://www.encyclopediaofmath.org/index.php/Mathematical_symbols