Diagrams 2024 14th International Conference on the Theory and Application of Diagrams. DIAGRAMS’24 will be held 27 September – 1 October 2024 in Münster, Germany diagrams-2024.diagrams-conference.org

"In the late 18th and early 19th centuries, the political situation in southern Italy was torn between tradition and modernity", begins Viktor Blåsjö Viktor Blåsjö's review zbmath.org/1526.01001 of Massimo Mazzotti's 'Reactionary mathematics. A genealogy of purity.' ... 1/3

The Utrecht University UtrechtSummerSchool Geometry Summer School will include a day of history of geometry taught by me and Jan Hogendijk: utrechtsummerschool.nl/courses/scienc…

I will be at the DIAGRAMS’24 conference in September: diagrams-2024.diagrams-conference.org/tutorials/ You can still apply to present at the Graduate Symposium diagrams-2024.diagrams-conference.org/calls/graduate… or the philosophy of mathematical practice workshop diagrams-2024.diagrams-conference.org/workshops/diag…

In the 20th century, philosophy of mathematics was hogged by logic and set theory nerds. So much so that the actually interesting part of philosophy of mathematics had to be rebooted under a new name: "philosophy of mathematical practice". link.springer.com/referencework/…

Spot the equilateral triangle! The king strikes such an unnatural pose in order to invoke Proposition 1 of Euclid’s Elements, thereby conveying that his authority is as immutable as the demonstrations of geometry.

Latest on the Unguru historiography wars: intellectualmathematics.com/blog/note-on-f…

Enjoyable conference trip to China. tianyuan.amss.ac.cn/ztyt/info/2024… iashs.nwu.edu.cn/info/1032/1653…

So moths end up inside your house at night because their brains evolved to navigate a world in which geometry is projective, where rotations=translations; yet human lighting breaks that expectation, and places them inside the much uglier world of non-projective spaces. (11/11)

Physical manifestation of the question: What’s the rate of change of the area of a square with respect to its diagonal? johanneslangkamp.com/growing-archiv…

How to Triangulate Your Dragon

Interesting comments on the geometrical algebra hypothesis in this review indeed. Among other things, "well-founded arguments have been advanced by V. Blåsjö" 🤗

Euclid in Syriac, from the new exhibition at Cambridge University Library. x.com/theUL/status/1…

Today I learned (ht Viktor Blåsjö) how Huygens summed the reciprocals of the triangular numbers. He regrouped the series and showed that it equals the geometric series 1+1/2+1/4+... = 2, like so!

hyperbolas

Yesterday we got a new Viktor Blåsjö podcast all about Torricelli's trumpet, infinite geometric objects, and myths of math history. Entertaining, informative, hilarious, & way more detail than you probably want on parsing passages from the 17th century. intellectualmathematics.com/blog/torricell…

Viktor Blåsjö's review of the book "Form & Number: A History of Mathematical Beauty" by Alan J. Cain, is now live at tug.org/books/reviews/…

Very comprehensive takedown of Galileo by Viktor Blåsjö I don't think anyone has tried to frame a rebuttal, which I would find interesting because I don't share the anti-philosophy biases of the author arxiv.org/abs/2102.06595