# Imaginary interest rates | Lockdown math ep. 5

From 3Blue1Brown.

Compound interest, e, and how it relates to circles.
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Great Mathologer video:
https://youtu.be/-dhHrg-KbJ0

Beautiful pictorial summary by @ThuyNganVu:
https://twitter.com/ThuyNganVu/status/1258221677990703105
https://twitter.com/ThuyNganVu/status/1258222002889875457

My other videos on imaginary exponents:
https://youtu.be/v0YEaeIClKY
https://youtu.be/mvmuCPvRoWQ

Mistakes:
In the off-handed remarks on quaternions, I mentioned rotation in 4d would require 10 degrees of freedom. That’s wrong, what I should have said was it requires 6 degrees of freedom, and rotation in 5D is what requires 10 degrees of freedom.

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