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:

Beautiful pictorial summary by @ThuyNganVu:

My other videos on imaginary exponents:

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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Music by Vincent Rubinetti.
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