the fact:https://www.youtube.com/watch?v=HM-kwHR4VO4&t=5s ,
the fact again, https://www.youtube.com/watch?v=2nUJMP_ZnnI&t=27s ,
series of n^n/(n!)^2,
limit of n^n/(n!)^2,
ratio test for series, good for nth power and factorial,


blackpenredpen,
math…

In this video I show that P(R), the set of subsets of the real number, is strictly larger than R (in terms of cardinalities). This shows, roughly speaking, that there’s a set that is more infinite than the real numbers. The proof uses Russell’s paradox, which…

A difficult Putnam question with an elegant solution.
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Good luck to all of you!!! I know finals are tough, but you can do it!!!! :)