The Deranged Mathematicians: Updates and Linear Fractional Transformations First of all: last week, the Deranged Mathematician hit 1k subscribers. Thank you very much to all of you who made that possible! Now, for the meat of this post: I have turned on paid subscriptions for the blog. Everything that was free before still is, and I only intend to keep about 50% of all posts behind a paywall. If you want the full details and/or to participate in a poll about what will be the first longer lecture series, see here: [Updates to the Deranged Mathematician](https://derangedmathematician.substack.com/p/updates-to-the-deranged-mathematician?r=74r0nc) Aside from providing access to the full archive, paid subscriptions also grant access to the draft of my book, *A Projective Perspective on Linear Fractional Transformations*.…