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Category: Concept

The Inexpensive Ventilator — Are We Building These ?

  • khoitsma
  • Concept, General
  • Forrest Bird, history, inexpensive, ventilator
  • 0 Comments

Percussionaire — Bird Respirator History Wiki — Ventilator

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The Lincoln Index — Software Bugs Jan 2020

  • khoitsma
  • Concept, Mathematics
  • 0 Comments

John, Thanks for the presentation. https://www.johndcook.com/blog/2010/07/13/lincoln-index/ The thrill of the chase

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Three Blue One Brown Feb 2019

  • khoitsma
  • Concept, Mathematics
  • 0 Comments

The craft and artistry are as impressive as the mathematical concepts.

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Photomath Jun 2018

  • khoitsma
  • Concept, General, Software
  • 0 Comments

Take a photo of a handwritten math problem and get the answer from your smartphone https://photomath.net/en/  

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  • Derive the Stiffness Matrix for a Beam Apr 2026
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  • Looking for a and b — and I accidentally re-proved the Pythagorean theorem Feb 2026
  • Derivative — polygon properties after offsetting one point Feb 2026

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