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Author: khoitsma

Structural engineer, Python programmer

Ecclesiastes 12

  • khoitsma
  • General, Personal
  • 0 Comments

Fear God and keep his commandments, for this is the whole duty of man.

Eccl 12:13

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What If, and Maybe Jul 2022

  • khoitsma
  • General, Observation, Personal
  • 0 Comments

What if each able-bodied homeowner mowed his/her own lawn, maybe also mowed the lawn of their neighbor who wasn’t able-bodied?

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Asymmetric Frame Loading Jul 2022

  • khoitsma
  • Calculus, Engineering, Jupyter, Mathematics, Plotly, Python, RISA-3D, SAP2000, Sympy
  • 0 Comments

In memory of Dr. Terry Kohutek, Texas A & M, Professor of Civil Engineering

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The Analog Clock Jul 2022

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

25 or 6 to 4
– Robert Lamm, Chicago

Haven’t we all looked at the clock face and wondered about the magical times where the hands cross?

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Structural Calculations for Beams Using Calculus via Sympy Jul 2022

  • khoitsma
  • Calculus, Computer Algebra, Engineering, Jupyter, Mathematics, Plotly, Python, Sympy
  • 0 Comments


Something about calculus and Sympy is lovable.

Click to see R1 plot; hover over data points to see data values; use finger or mouse to select rectangular area of interest

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Best of Seven Jul 2022

  • khoitsma
  • General, Kids (middle school and up), Probability/Statistics
  • 0 Comments

The question here is, what is the likelihood of each possible playoff outcome?

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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