Author: khoitsma
Structural engineer, Python programmer
Divisibility July 2026
Narlin Beaty’s Polyominos June 2026
Protected: Custom iPhone Shortcuts May 2026
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Marion Walter’s Theorem May 2026
Derive the Stiffness Matrix for a Beam Apr 2026
Enjoy !
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Instant Access to all Posts
Posts — Editor's Picks
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)
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)
Instant Access to all Posts
Posts — Editor's Picks
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)
Barnard’s Star and the 'Wait Equation'
IOP counterargument
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)
