taryneast comments on Joint Configurations - Less Wrong
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Actually, I was in exactly the same position.
Then I actually read the article from the comment above (to refamiliarise myself with the maths), and was quite surprised to find that the article makes this relation very clear.
Worth a look. :)
Oh my god...imaginary numbers...they make sense now! Seriously, thank you for that link. I've gotten all the way through high school calculus without ever having imaginary numbers=rotation explained. Looking at the graph for 10 seconds completely explained that concept and why Eliezer was using imaginary numbers to represent when the photons were deflected.