/sci/ - Science & Math

>>15600788
Helps a lot with geometric transformations that may involve negative numbers. Sometimes a formula needs 2 variations depending on if it's dealing with a positive or negative value. Obviously this can be problematic. i is really useful because when squared, you just get -1, which can conveniently flip the sign on a value that may fuck up the transformation when crossing the axis.

That's the simplest (and only) use case I can wrap my head around.

pic totally unrelated, it's just been cracking me up for days and I can't stop thinking about it

>>14967266
Nice.