Leen Noordzij – This blog is about, business, climate change, culture, economics, physics, education, Fermat, history, innovation, mathematics, politics, quantum mechanics and technology.

When everybody is going in one direction, choose another one.

Groupthink is the end of humanity.

3 Dec 20213 Dec 2021Leen NoordzijLeave a Comment

Quantum Mechanics in Pennsylvania-Undergraduate Course Updated 2021-12-03 Chapter 8, Schrödinger Wave Equation, 1-D Quantum Systems Problem 8.15.3 Repulsive Potential a) to be continued.

3 Dec 20213 Dec 2021Leen NoordzijLeave a Comment

Adaptation to Climate via Morphological Change and the Isoepifaeic Inequality Updated 2021-12-03 and Edited § 4.3.1 Optimize the Sphere and the Cone up to the dimensionless surface

3 Dec 2021Leen NoordzijLeave a Comment

Wiskunde D Online VWO 5 Summary Blok 8-14 and Solved Problems Mathematics, Preparation for College, yOUlearn Blok 11 Dynamical Processes Les 2, 2021-12-03 Edited summary en opgave 6 in de tekst.

1 Dec 2021Leen NoordzijLeave a Comment

Wiskunde D Online VWO 4 Summary Blok 1-7 and Solved Problems Mathematics, Preparation for College, yOUlearn Updated Blok 1 Les 1, 2021-12-01, Layout en Typos

13 Nov 202113 Nov 2021Leen NoordzijLeave a Comment

A Platform-Expert System to support Business and Society with Compliance for Regulations on Climate Change, GDPR, CCPA, Product Safety and Health. Edited and Updated 2021-11-13, Chapter 11 Valuation Pricing Power

1 Nov 2021Leen NoordzijLeave a Comment

Climate Change: From Fossil to Solar, Wind, Hydrogen and Nuclear From here to eternity. Updated 2021-11-01 Up to section 13.4 A long bridge to the future of renewables up to page 28

1 Oct 2021Leen NoordzijLeave a Comment

Mijn geschiedenis van de haven van Pernis. 1942-1954, de haven, het water en de watersnood. Updated 2021-10-01, Aanvullingen: de Sluis en de tuin van Buesink

29 Aug 202129 Aug 2021Leen NoordzijLeave a Comment

Isoperimetric Inequality: a Proof by Fourier Expansion, and a proof with isosceles triangles Updated 2021-08-29. § 4 Edited

16 Aug 202116 Aug 2021Leen NoordzijLeave a Comment

Quantum Mechanics and the Theoretical Minimum Updated 2021-08-16 Section 4.8 Ignoring the Phase Factor in Exercise 3.4 and the matrix σn some phase factors could not be ignored.

9 Aug 20219 Aug 2021Leen NoordzijLeave a Comment

Prime Numbers, Pythagorean Triples and Goldbach’s Conjecture Updated 2021-08-09 Edited, Prologue The Babylonians

dr.l.noordzij@leennoordzij.nl