The Deranged Mathematician
Senia SheydvasserThe personal Substack of mathematician Senia Sheydvasser, all about learning math and its applications.
| Platform |  | Pricing | Freemium | Publishes | Twice weekly |
|---|---|---|---|---|---|
| Issues | 53 | Founded | 7 months ago | Last Issue | 8 days ago |
| Active | |||||
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derangedmathematician.substack.comLatest Issues
A Primer on Measure Theory
This is a standalone post, although in some ways it acts as a bridge between two posts that I have already written and another that I intend to write.
Specifically, a recurring theme in this post is that we will study under what circumstan...
Classifying Groups
Last time, we discussed Lagrange’s theorem, the orbit-stabilizer theorem, and their myriad consequences.
As part of these corollaries, we successfully classified all groups with no more than 8 elements, up to isomorphism. (If you read care...
What do Brazil, Auctions, and Multi-Threading Have in Common?
I have argued before that one of the things that makes math math is the fact that context doesn’t matter—structure does. You can define a certain mathematical concept, and then have it appear in many different contexts, because the logical...
How to Count (with Symmetry)
In our last lecture, we proved the ping-pong lemma and showed how it can be used to compute presentations of various groups.
At least for now, this wraps up what I want to do with regard to the geometric side of group actions. But we went...
Is Category Theory Practical?
I had a post last month about category theory and how it was useful from a big-picture, philosophical point of view.
I think that that alone is sufficient to justify its study—I’ll talk a bit more about why in a second.
Furthermore, categ...
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