would be interesting to sort arXiv on duration between paper revisions. my candidate for longest? arxiv.org/abs/math/0405482 ←12 years between v1 and v2

Gauge theory of the falling cat Richard Montgomery people.ucsc.edu/~rmont/paper… Santa Cruz, California • 1993

Riemann, Topology, and Physics Mikhail Ilʹich Monastyrskiĭ books.google.com/books/about… Moscow • 1979–1987

Living in the Labyrinth Diana Friel McGowin play.google.com/store/books/… Orlando • 1992

Christ stopped at Eboli Carlo Levi archive.org/details/christst… Florence/Lucania/Basilicata/Grassano/Aliano • 1947

Three hours with Ibn Battûta: youtu.be/b1d5qcVP7ig youtu.be/hdOBbopxVME youtu.be/VSVVSCQ6qDM

Kummer’s Quartic Surface Ronald William Henry Turnbull Hudson archive.org/details/quartics… Liverpool • 1903

–1 4 11 –3 2 9 2 7 14 –1 + 2 = 4 – 3 –1 + 14 = 2 + 11 row_2 = row_1 + constant 2 –3 + 7 + 11 = 9 + 4 + 2 And the rules for each of these patterns all generate the same vector space of matrices.

Eveline Séquin, 1993 24-heptagon subgroup of the 168-sided Klein quartic PSL(2,7) on a genus-3 surface bridgesmathart.org/carlo-mir…

Making matrices better: Geometry and topology of polar and singular value decomposition Dennis DeTurck Amora Elsaify Herman Gluck Benjamin Grossmann Joseph Hoisington Anusha M.Krishnan Jianru Zhang 2017 arxiv.org/abs/1702.02131

The sensual #quadratic_form by John Conway #superbases #lattice #multilinear archive.org/stream/X788QX7XS…

Clarity. From lattice to matrix to cells of a “topograph”.

"pogroms, plagues, discrimination, Hitler, … sometimes I think we'd have been better off never being born!" "Of course! But who has such luck? Not one in 50,000…"

from Ausubel. Jew 1: if I were as rich as Rothschild, I'd be richer than Rothschild. Jew 2: oh? how's that? Jew 1: of course, I'd teach a little on the side.

Geordie Williamson an innocent bystander’s illustrated guide to perverse sheaves What do algebraic #varieties and #elliptic curves look like? #Goresky #MacPherson #Kleiman #Migliorini @BarbaraFantechi #derived #intersectionHomology

Spin geometry Jose Figueroa-O'Farrill Edinburgh, 2011 empg.maths.ed.ac.uk/Activiti…

Borcherds has a YouTube channel. youtu.be/f8pjt9ivjjc

best expository mathematics article I’ve read on any topic: Kai Behrends’ explanation of stacks. math.ubc.ca/~behrend/math615…

Brieskorn/Stillwell: "the cissoid of #Diocles is not actually ivy shaped. That name for his curve, which solves the #Delian problem, originated two millennia later, 16 centuries after Christ. Ivy does have a cusp, or return point=a #singularity.

the 3 sorts of #caustics #singularities #Brieskorn #Arnol'd