Do you find some mathematical activities useless?

[zeno333]

(04-05-2018 05:55 PM)Maximilian Hohmann Wrote:  

(04-05-2018 04:51 AM)Joe Horn Wrote:  To me, "e^(i*pi)=-1" is a striking example of beauty in mathematics.

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"...