Do you find some mathematical activities useless?

[Gerald H]

(04-05-2018 06:15 PM)zeno333 Wrote:  

(04-05-2018 05:55 PM)Maximilian Hohmann Wrote:  This is an excellent example of how human ingenuity invented complex numbers to link two seemingly unrelated natural constants. Almost as amazingly incredible as E=mc^2 (which is rather physics than mathematics of course). But as you write, "beauty" is something different for everybody.

People did not invent Complex numbers, they were "discovered"...

What country were they discovered in? Were they lying on the surface or buried in the earth? Were they situated in a larger body of maths artefacts?