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What Happened to the US Machine Tool Industry? Jan 2024

  • khoitsma
  • General, History
  • 0 Comments
A serious article
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What is the Day of the Week? Jan 2024

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


odd months

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Excel — Dictionary References with PyXLL Jan 2024

  • khoitsma
  • Concept, Excel, Python, PyXLL
  • 0 Comments
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Hand Calculated Truss vs RISA Dec 2023

  • khoitsma
  • Calculus, Computer Algebra, Engineering, Jupyter, Mathematics, Plotly, Python, RISA-3D, Sympy
  • hand calculated, RISA, truss
  • 0 Comments

truss diagram

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Kolam Muggu Rangoli Dec 2023

  • khoitsma
  • Calculus, General, Mathematics, Science
  • 0 Comments

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Wolfram — Writings Dec 2023

  • khoitsma
  • Calculus, General, Mathematics, Science
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‘The Concept of the Ruliad’
‘Expression Evaluation and Fundamental Physics’

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  • Lessons Learned (structural engineering) Apr 2025
  • Marimo Notebook Mar 2025
  • Fixed Fixed Beam with a Moment at any Point — Superposition Mar 2025
  • Nobel Prize winner from NSF SSTP
  • Cantilever with a Concentrated Load at any Point — Castigliano’s 2nd Theorem Feb 2025

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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
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Two Semicircles
Japanese temple geometry
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