Rename 'im' constant to iota

[Varriount]

According to https://en.wikipedia.org/wiki/Imaginary_unit#Alternative_notations , the 'i' constant (sqrt(-1)) is often noted by use of the iota symbol (ɩ). I believe that the current name for sqrt(-1) is rather short and not very obvious, and think that 'iota' is a better name (since actually using the iota symbol would be a pain to type).

Since this constant was just added, it shouldn't break anything existing.

[dom96]

Not sure if iota is best here:

In some programming languages (e.g., A+, APL, C++, Go[6]) iota (either as a lowercase symbol ι or as a keyword iota) is used to represent and generate an array of consecutive integers. For example, in APL ι4 gives 1 2 3 4.

I'm also reminded of iota in VDM-SL which means something else.

[jcosborn]

What about ComplexI (or complexI) as in C?

[Paalon]

In the context someone want to use complex module, I think it's obvious im is imaginary unit. I haven't seen a textbook or source code or paper where iota or ι was used to represent imaginary unit.

[Vindaar]

Never seen a physics textbook (haven't read other kind of books using complex numbers) use iota either. Maybe in some other areas it is indeed used, but I prefer either im or complex. Especially im is intuitive imo, due to the Re and Im notation.

[andreaferretti]

Never heard any mathematician use iota as well - it is definitely an i! :-)

[Araq]

Sorry, but im is just fine. Closing.