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Month: September 2021

Janis Joplin Sep 2021

  • khoitsma
  • General
  • 0 Comments

A surprising page from her high school yearbook.

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Mathpix Snip Sep 2021

  • khoitsma
  • Mathematics, MathPix, Software
  • 0 Comments

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The (W)rapper Tower Sep 2021

  • khoitsma
  • General, Steel Detail
  • 0 Comments

Should this be celebrated?
Maybe only as a lesson learned.

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Mt Palomar and the Hale Telescope Sep 2021

  • khoitsma
  • General, Science
  • 0 Comments

What is the English translation of Palomar (hint: not what I thought)?

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The OEIS Foundation Sep 2021

  • khoitsma
  • Mathematics
  • 0 Comments

· Charming, crazy, LOL — the Sloane sequence A300000
· Mesmerizing — the Sloane sequence A250001

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Visual Math Sep 2021

  • khoitsma
  • Mathematics
  • 0 Comments

Picture story

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Recent Posts

  • Close Encounters in Batting Averages July 2025
  • 2D Engineering Interpolation Jun 2025
  • The Bookshelf May 2025
  • Lessons Learned (structural engineering) Apr 2025
  • Marimo Notebook Mar 2025

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Instant Access to all Posts
Short Takes
My Dash apps

My GeoGebra app
What is the most general equation for the area of a triangle?
The Wait calculation
The incessant obsolescence postulate (IOP)
Barnard’s Star and the 'Wait Equation'
IOP counterargument
The amazing arbelos
Surprises found in the arbelos (1954)
Arbelos from Wolfram MathWorld
Circle Theorems
• Circle Theorems Marked
• Circle Theorems — Practice
Two Semicircles
Japanese temple geometry
★ Sister Celine — a beautiful life
★ John Lienhard IV on Ingenuity
★ Charles Stutzenbaker, Field Biologist
Neal Stephenson on the OS
A few quotations

Tyler TX weather • 🌡 Steve Fitzgerald
Tyler TX weather • 3-day history
Tyler TX weather • calendar month
Tyler TX weather • graph month
East Texas weather • TAMU
★ All of the water in the world

Hacker News (from YCombinator)
Diaorifa
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Pentagonal number visual proof

Bayes theorem visual proof

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