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Author: khoitsma

Structural engineer, Python programmer

Howe Baker Jun 2021

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  • General
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Not sure of the artistic quality

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Do Not Squander Time May 2021

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  • General
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Quotes

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The Suez Canal — How Ships Float May 2021

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  • Concept
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I started thinking about the support of floating ships — in detail.

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RoadPrinter — Dutch Paver Brick Paver Machine Apr 2021

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Link to YouTube video

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Fascinating Science Lectures Mar 2021

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  • General, Kids (middle school and up), Science, Video
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Richard Dawkins

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Mathematics — Corner Case — The Hallway Problem Feb 2021

  • khoitsma
  • Mathematics
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Determine the longest beam that can turn the corner of two halls of given width, x and y.

hallway diagram

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Posts navigation

Older posts
Newer posts

Recent Posts

  • The Triangle of Minimum Perimeter Nov 2025
  • NotebookLM Cather Oct 2025
  • Minimal Footprint Dropdowns in Excel Oct 2025
  • Bow Out Aug 2025
  • Automated Foundation Rebar Drawing Aug 2025
  • Close Encounters in Batting Averages July 2025
  • 2D Engineering Interpolation Jun 2025
  • Lessons Learned (structural engineering) Apr 2025
  • Marimo Notebook Mar 2025
  • Fixed Fixed Beam with a Moment at any Point — Superposition Mar 2025
  • NotebookLM Feb 2025

Archives

QuickLinks


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 (only good on a real desktop)
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

Dice Distribution (bar)

Bayes theorem visual proof

Bayes icon