Calculator test

[rprosperi]

(12-06-2024 10:27 PM)Commie Wrote:  Hi Ladies and Gents,

Euler, in the 18th century wrote down a very important equation, this being in one form can be written:

e^(pi.i)=cos(pi)+i.sin(pi) which equates to e^(pi.i)=-1

Which can be written as e^(pi.i)+1=0

Know we can also deduce that pi.i=ln(-1)

Key in ln(-1) into your best calculator and hit return, your calculator should give pi.i, if it throws up a domain error try putting into complex rectangular mode and try again.

As expected, my hp15ce and ti30x pro mp throws up error 0, which didn't surprise me.

Cheers
Darren

Is the notation used here "xyz.i" some kind of standard shorthand for "xyz*i" ? Not saying it's bad or wrong, I'm just not familiar with it. Where is it from?