In which we show that the knots K13n592 and K15n41127 (pictured) both have stick number 10. These are the first non-torus knots with more than 9 crossings for which the exact stick number is known.
Article by Erickson, Jeff
In collections: Unusual arithmetic, Easily explained
CRA finally copies MathJobs: https://cra.org/cv-database/
How to peel self-intersecting onions: https://arxiv.org/abs/1909.00263
Update on the Safe ToC initiative: https://windowsontheory.org/2019/08/30/update-on-the-safe-toc-initiative-guest-post-by-sandy-irani/
Sandy Irani describes progress in combatting harassment and discrimination at theoretical computer science conferences, and calls for volunteer advocates to serve as contact points at conferences.
$400 online calculus course for full (transferrable) credit at Pitt: https://outlier.org/calculus
While it's tempting to call this a MOOC, but it's not open. Let's give them the benefit of the doubt and call it a MOC.
(Written when the author was 11, and submitted when he was 12. See the affiliation "Jr. High School 246" on the last page of the article, and the letter from the author's mother on page 91 of the same issue.)
https://aeon.co/essays/how-european-sailors-learned-celestial-navigation — "Soon after this, mariners started cramming for exams. Instead of paying 36 florins for an entire winter of lessons, Amsterdam-based mariners paid just 6 florins for a crash course focused on the oral and written portions of the tests. Later manuscript workbooks confirm this strategy: students often focused on the questions they knew would be on their exam. Teachers at the close of the 17th century were already ‘teaching to the test’."
Someone's been reading William S Burroughs: https://aeon.co/videos/a-classic-film-finds-order-in-randomness-with-the-aid-of-some-improbably-elaborate-sets
Mental Health in the Mathematics Community, by Mikael Vejdemo-Johansson, Justin Curry, and Julie Corrigan, in the most recent Notices of the AMS.
The earliest PROOF of the polygon triangulation theorem that I'm aware of is an unpublished 1899 manuscript of Dehn! See https://www.maths.ed.ac.uk/~v1ranick/papers/guggenheim.pdf
...Following a rabbit hole inspired by the Numberphile's recent video on Dehn invariants: https://www.youtube.com/watch?v=eYfpSAxGakI
A triangulated polygon, from Les Amusemens Mathématiques by André-Joseph Mancoucke, 1749. This is the earliest appearance I know of the theorem (stated without proof) that every simple polygon can be triangulated by diagonals. In particular, Mancoucke predates both Meister's (1770) and Poinsot's (1809) seminal treatises on polygons.
CS professor at Illinois
A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.
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