What are...normal and separable extensions?

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Goal.
Explaining basic concepts of (a classical course in) algebra in an intuitive way.

This time.
What are...normal and separable extensions? Or: Linear factors matter

Disclaimer.
Nobody is perfect, and I might have said something silly. If there is any doubt, then please check the references.

Nonsense.
On the “No multiple roots” slide, the derivative should start with na_nX^(n-1).

Slides.

Material used.

Formal derivative.

Mathematica.

#algebra
#galoistheory
#mathematics
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@18:23 small typo, I guess the leading term there should read na_n X^{n-1} instead of na_n X^n

RahulMadhavan