@joshuaz1.bsky.social
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JZ wrote a short story: "The Ultimate Kitchen Sink: An Oral History of the Last Days of Man."
joshuazelinsky.dreamwidth.org/12254.html
19 days ago
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reposted by
Quanta Magazine
4 months ago
This is the Noperthedron. A portmanteau of “nope” and “Rupert,” it is the only known shape that does not have a trait called Rupert’s property. No matter how you bore a straight tunnel through it, a second Noperthedron cannot fit through.
www.quantamagazine.org/first-shape-...
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Teaching summer enriched precalculus. Midterm is tomorrow. One thing I did today was to do an "Um, Actually" style game with the students where they had to say what was wrong with each statement. Here's my statement list:
drive.google.com/file/d/1-8qk...
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Um_Actually_for_Math_55_Exam_1.pdf
https://drive.google.com/file/d/1-8qkJdd7KJRLNfV2rPBkSwTbSgdNTxmu/view
8 months ago
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My D&D players were going through a dungeon that had a long corridor with a series of different traps each activated by a pressure plate. They had spotted the pressure plates and were carefully walking by. Then the third plate reached out and attacked them. Turns out it was a pressure plate mimic.
8 months ago
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reposted by
David Bier
9 months ago
Cato has published my comprehensive review of the ~240 Venezuelans the US government renditioned 2 months ago to Salvador’s notorious prison. We identified FIFTY who came legally, never violated any immigration law, but are imprisoned at the US government’s request and at US taxpayer expense.
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reposted by
Quanta Magazine
10 months ago
According to mathematical legend, Peter Sarnak and Noga Alon made a bet about optimal graphs in the late 1980s. They’ve now both been proved wrong. Leila Sloman reports:
www.quantamagazine.org/new-proof-se...
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New Proof Settles Decades-Old Bet About Connected Networks | Quanta Magazine
According to mathematical legend, Peter Sarnak and Noga Alon made a bet about optimal graphs in the late 1980s. They’ve now both been proved wrong.
https://www.quantamagazine.org/new-proof-settles-decades-old-bet-about-connected-networks-20250418/
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arxiv.org/abs/2504.10394
A neat paper by Paula Roba and Karlis Podnieks just came out showing that the digits of pi (and e and some other constants) don't actually seem to follow a lot of statistical tests we might expect if they were genuinely random.
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Digits of pi: limits to the seeming randomness II
According to a popular belief, the decimal digits of mathematical constants such as π behave like statistically independent random variables, each taking the values 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 wi...
https://arxiv.org/abs/2504.10394
10 months ago
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My Algebra II students have been making tricky log system problems that have nice answers.
drive.google.com/file/d/1Iu6A...
has their problems and answers. They had a lot of fun making these, and some of these are just fiendish.
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Math_48_Tricky_log_system_problems_from_your_classmates.pdf
https://drive.google.com/file/d/1Iu6AZyTTTQGMiDf1S0uLGO6rFHDqUoYX/view?usp=sharing
11 months ago
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Challenge problem I'm considering giving to my Accelerated Algebra II students: Can you find all natural numbers a and b such that log_3 a + log_9 b = log_3 (a+2b) ?
11 months ago
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The Hebrew word tachash is mentioned in Exodus 26 as some form of animal whose skin was used to make the Tabernacle. The most common translation of Tachash is dolphin although others suggest some other sea creatures. 1/2
11 months ago
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A fun problem I just saw today: Find all primes p such that p+1 = 2x^2 and p^2+1=2y^2 where x and y are both integers.
12 months ago
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reposted by
Caleb Shor
12 months ago
Another PROMYS for Teachers workshop tonight. There were some really fun show-and-tell presentations: * Shapes of various shadows of polyhedra. * How to see every positive integer coprime to 10 has a multiple that consists of all 9s (or 1s?). * The existence of “printer errors” like 2^5 9^2 =2,592.
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Let G be a graph. We will say it has property M if every maximal clique of G is the same size. Is there a standard name for property M?
12 months ago
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With everything else the Trump administration is doing it is easy for things to get lost in the noise.
www.huffingtonpost.co.uk/entry/cdc-wh...
is an example that is petty, vindictive, and will like result given authorship ethics rules in the destruction of ongoing nearly finished scientific work.
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CDC Staff Prohibited From Co-Authoring Papers With World Health Organization Personnel
It’s just the latest “Orwellian” crackdown on government scientists.
https://www.huffingtonpost.co.uk/entry/cdc-who-publication-memo_n_67c1eb34e4b0bf54864084cf
12 months ago
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Republicans who said loudly that Biden wasn't supporting Ukraine enough, maybe we could get your voices again to help Ukraine? Just a thought.
12 months ago
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reposted by
Catherine Rampell
about 1 year ago
On Friday night, HHS ordered CDC to take down all flu vaccine campaign materials from its website. Materials are starting to come down. For example, a campaign explaining that flu shot can reduce flu severity from "wild to mild" is now offline. Left image is from Friday, right is now Meanwhile...
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A review problem I gave my Algebra II Accelerated students in our polynomial unit. Factor 81x^4 +216x^3 +216x^2 +96x + 15. My hint was that this is almost in the form of Pascal's triangle but not quite.
about 1 year ago
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A problem for my Algebra II Accelerated students: Find all x and y such that 1/(x+y) = 6/(1/x + 1/y), 1/x = 1/y +1, and x^2 = 1/(16y +1).
about 1 year ago
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My twin gave an interview
www.wypr.org/show/midday/...
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A former federal prosecutor on what a new Dept. of Justice means for Maryland, and the rule of law
Former federal prosecutor Aaron Zelinsky, a former member of the Robert Mueller special counsel team, won convictions of President Donald Trump confidant Roger Stone and former Baltimore City State’s ...
https://www.wypr.org/show/midday/2025-01-28/a-former-federal-prosecutor-on-what-a-new-dept-of-justice-means-for-maryland-and-the-rule-of-law
about 1 year ago
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Found out about a neat open problem today: Does there exist a 4th degree polynomial p(x) such that all roots of p(x) are distinct integers, and the same is true for all non-zero derivatives of p(x)?
about 1 year ago
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