Mathematics, numbers, and geometry
Last update 5 November 2022
Nice online calculator (website in German): https://web2.0rechner.de
Online integral calculator from Wolfram Research: https://www.wolframalpha.com/calculators/integral-calculator/?expr=x%5E2%2F%28a+%2B+Log%5Bb+x%5E2%5D%29&random=false
A true random number generator which is based on atmospheric noise: https://www.random.org
Golden Ratio: https://www.goldennumber.net
Mathematics atelier by Dr. Elisabeth Welz in Switzerkand (in German): http://www.mathematikatelier.de
Sacred Geometry Academy: https://sacredgeometryacademy.com
5 November 2022 Oloid - A special geometric shape or solid discovered by the Swiss sculptor and mechanical engineer Paul Schatz:
- Website of the Paul Schatz Foundation in Switzerland (in German, English version under construction): https://paul-schatz.ch
- Available shapes, solids, and related products: https://www.kuboid.ch
- Website of the German company OLOID: https://www.oloid.de
- A published paper: The Development of the Oloid, Hans Dirnboeck and Hellmuth Stachel, Journal for Geometry and Graphics, Volume 1 (1997), pages 105 - 118: https://www.heldermann-verlag.de/jgg/jgg01_05/jgg0113.pdf
- Wikipedia about the Oloid (in German): https://de.wikipedia.org/wiki/Oloid
- Movement of an Oloid - A WOLFRAM Demonstrations Project: https://demonstrations.wolfram.com/MovementOfAnOloid
Projective geometry:
- Projective Geometry: From Foundations to Applications. Albrecht Beutelspacher and Ute Rosenbaum, first published 1998 (pdf, file size 10 MB): https://www.maths.ed.ac.uk/~v1ranick/papers/beutel.pdf
- Webpage by Wolfram Research: https://mathworld.wolfram.com/ProjectiveGeometry.html
- Antrophosophic website about projective geometry: http://nct.goetheanum.org . It comprises several links and subpages such as a webpage about the so-called counter space, namely http://nct.goetheanum.org/counter.htm
- German-language paper "Der Bergriff des Gegenraumes" about the so-called counter space by Oliver Conradt, published in the journal "Elemente der Naturwissenschaft" 75, 2 / 2001 (abstract also in English) (pdf): https://mas.goetheanum.org/fileadmin/mas/downloads/Mitarbeitende/ConradtOliver/gegenraum.pdf
Dr. Peter Plichta's website about numbers, prime numbers, chemistry, science, and Platon's space mirror (in German): http://www.plichta.de/plichta