Here’s a plot of exp(6*it*)/2 + exp(20*it*)/3:

Notice that the plot has 7-fold symmetry. You might expect 6-fold symmetry from looking at the equation. Where did the 7 come from?

I produced the plot using the code from this post, changing the line defining the function to plot to

def f(t):
return exp(6j*t)/2 + exp(20j*t)/3

You can find the solution in Eliot’s comment in this Twitter thread.

## Related links

I don’t see an Eliot comment in that thread. Spoiler, please? :)

Ah, found it – twitter wasn’t showing nested replies in the thread :(

https://twitter.com/eliot4fois17/status/1270836663904763904