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Author: khoitsma

Structural engineer, Python programmer

Digit Sums and Cyclic Patterns Jan 2023

  • khoitsma
  • Concept, Mathematics
  • 0 Comments

Excerpt from the paper

‘This simple pattern may be recalled when students are first exposed to cosets and quotient groups much later in their academic career, as the set {2, 8} is one of six cosets in the quotient group C12/{0, 6}.’

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Monty Hall — Consider Only Strategy Dec 2022

  • khoitsma
  • Concept, Probability/Statistics
  • 1 Comment

And what’s the chance it’s a yellow car?


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PyXLL using Jupyter and PySimpleGUI Interface (with video) Dec 2022

  • khoitsma
  • AISC, Excel, Jupyter, PySimpleGUI, Python, PyXLL, Video
  • 0 Comments

This post features:
  the PyXLL add-on
  Jupyter
  the PySimpleGUI graphical interface

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Python — develop, sell, deploy, protect Nov 2022

  • khoitsma
  • Concept, Excel, Python, PyXLL, Software
  • 0 Comments

In 2022, let’s consider the difficulties of development using Python.

Hint: it isn’t the programming.

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Immensely current song Nov 2022

  • khoitsma
  • General
  • 0 Comments



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Buckminster would be proud Nov 2022

  • khoitsma
  • Concept, General, Kids (middle school and up)
  • 0 Comments

… maybe

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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

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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

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Diaorifa
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