Lee Bollinger, president of Columbia University: "No, I won’t start spying on my foreign-born students", https://www.washingtonpost.com/opinions/no-i-wont-start-spying-on-my-foreign-born-students/2019/08/29/01c80e84-c9b2-11e9-a1fe-ca46e8d573c0_story.html

https://doi.org/10.1016/0097-3165(95)90062-4

Stop using Zip Codes for geospatial analysis: https://carto.com/blog/zip-codes-spatial-analysis/, via https://www.metafilter.com/182600/humans-dont-behave-based-on-administrative-units

The problem is that they are designed to be convenient for the post office (geographically compact) rather than convenient for demographers (they sometimes combine areas that have quite different groups of people in them). The linked article is by a group selling software for one alternative subdivision that works better, but recommends several others as well.

Anyone know how to remove followers from a dead and defederated mastodon instance, or from an instance that redirects profile pages off-site?

Although freefedifollowers.ga is now defederated from my instance, my profile still lists many followers from there. The only instructions I can find for removing followers say to go to their profile and block them from there. But their profiles used to redirect to youtube and are now deadlinks. So I can't do it that way.

Are there any other ways?

So yeah, it's 2019, someone fixed bugs in the linux kernel's *floppy driver*, and these are 3/5 of the changes:

"floppy: fix out-of-bounds read in copy_buffer

floppy: fix invalid pointer dereference in drive_name

floppy: fix out-of-bounds read in next_valid_format"

https://twitter.com/Foone/status/1151654951203958785

<< I'd had a tab open with a bunch of text for about 6 hours and I've been meaning to read it and I haven't yet.

the best part? it's about ADHD and how it stops you from doing things. >>

A formula for designing lenses with no spherical aberration: https://petapixel.com/2019/07/05/goodbye-aberration-physicist-solves-2000-year-old-optical-problem/

This seems to have little practical value as there was already a numerical solution, and I don't think it handles chromatic aberration, but it's interesting that there is an analytic formula for these shapes.

https://nl.wikipedia.org/wiki/Vlag_van_Amsterdam

Turkey has charged over 700 academics with terrorism for signing a peace petition: https://www.insidehighered.com/news/2019/07/01/about-700-academics-have-been-criminally-charged-turkey-their-signatures-petition

Among the most severely penalized among them is Tuna Altınel, a mathematician in France who was arrested visiting family in Turkey, and who has now been imprisoned for over 50 days. For more see http://math.univ-lyon1.fr/SoutienTunaAltinel/?lang=en (via https://cameroncounts.wordpress.com/2019/05/31/tuna-altnel/)

For multisets, add extra pair of (), see https://tex.stackexchange.com/questions/5816/multiset-notation-in-latex

NEW: U.S. political operative Paul Manafort received payments for consulting work in Ukraine through over a dozen shell companies thanks to veteran Cypriot lawyer Kypros Chrysostomides, known by some as “Dr. K.”

https://www.occrp.org/en/investigations/the-curious-case-of-dr-k-and-mr-chrysostomides

The slope number of a graph G is the minimum number of distinct gradients of the edges in a straight line drawing of G.

An open problem that is very nice in my opinion: When Δ(G)≤3 the slope number of G is at most 4. For any k there is a graph G with Δ(G)=5 and slope number >k. But what about Δ(G)=4?

Not really my area at all but I like questions like this: where's the boundary?

Joined Feb 2019