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Working on answering my own question from a 25-years old paper I wrote while completing my PhD. Getting old? 🙂

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Stop using Zip Codes for geospatial analysis: carto.com/blog/zip-codes-spati, via metafilter.com/182600/humans-d

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.

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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?

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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"

#RewriteItInRust #Rust #rustlang

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<< 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. >>

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A formula for designing lenses with no spherical aberration: petapixel.com/2019/07/05/goodb

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.

Via news.ycombinator.com/item?id=2

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On this day a year ago we started with a small side project to host OpenBSD VMs on OpenBSD.

We couldn't imagine the interest that followed, 283 VMs, 8 hosts dedicated to vmm(4)/vmd(8).

Thank you all! And a huge thanks to @mlarkin, @reyk and Ori Bernstein


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Turkey has charged over 700 academics with terrorism for signing a peace petition: insidehighered.com/news/2019/0

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 math.univ-lyon1.fr/SoutienTuna (via cameroncounts.wordpress.com/20)

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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.”


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Today my advisor said:

Reading mathematics is like obesity. If you read too much, then it will only confuse you and will be harmful.

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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?


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> We shouldn't be applauding developers like Tusky or Funkwhale when they block Gab. We shouldn't be surprised when decent people do decent things. This should be expected. It's when it doesn't happen that we should be outraged.

You nailed it.

The fact we had to make this statement and received so much visibility and sincere "thank you!" replies from it makes me ashamed, on so many levels…

We're basically gaining traction and attention *because* the current situation is bad. Even the slightest move in the opposite direction feels like an incredible improvement.

This is fucked up.

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If anyone with Unix skills (and preferably some development skills as well, but not really a requirement) wants a job, my employer has some openings right here in Singapore. You don't need to live in Singapore to apply.

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♲ @staticsafe@mastodon.zombocloud.com: Introducing people.kernel.org

"Ever since the demise of Google+, many developers have expressed a desire to have a service that would provide a way to create and manage content in a format that would be more rich and easier to access than email messages sent to LKML. Today, we would like to introduce people.kernel.org, which is an ActivityPub-enabled federated platform powered by WriteFreely and hosted by very nice and accommodating folks at write.as."


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Remember how Facebook said your 2FA phone number was for security then used it for advertising? And their VPN that actually spied on you?

Any way, they said their Libra crypto currency is handled by a different group and they won't access your financial data.

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"Fundamental to liberal democracy is the ability to have sacrosanct private spaces. That is where the life of civil society exists. It is where our own personal lives exist, where we are able to pursue our dreams and passions. And it is often where we hold power to account. When you uncover those spaces, you fundamentally put all of those things at risk."

-- Holland Michel, author "Eyes in the Sky"

#surveillance #privacy #GorgonStare


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A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes. Use \( and \) for inline LaTeX, and \[ and \] for display mode.