aether(21) aether(1) big-bang(2) black-holes(2) book(1) book-review(4) book-reviews(1) boscovich(1) bubble-stability(1) chemistry(1) cnps(2) cnps-2017(1) cnps-2018(4) cnps16(4) conference(12) conflation(1) cosmology(5) critical-thinking(2) cycle(1) dark-matter(3) dinosaurs(2) directors(1) dissident-science(1) earth-expansion-palaeogravity(1) einstein(2) elections(3) electricity(1) electrodynamics(1) expanding-earth(1) expansion-tectonics(14) field-equations(1) field-theory(1) fqxi(2) fractals(1) general-relativity(1) global-warming(1) gravity(12) hilbert-book-test-model(1) hilbert-space(1) instructional-video(1) interesting-article(1) ionization(1) kinetic-theory(1) light(20) lorentz(1) mainstream(4) marketing(1) mathematics(2) member(1) members(23) memorial(3) michelson-morley(1) natural-philosophy(1) news(4) newsletter(2) nucleation(3) palaeogravity(1) philosophy(10) photons(1) physics(13) post-format-image(1) president(1) press-release(1) proceedings(2) publishing(1) quantum-mechanics(1) reduced-gravity(2) relativity(1) relativity(23) relativity-theory(1) sagnac-effect(1) science(4) scientist(1) scientist-profile(1) sciflix(1) sharelatex(1) space(1) space-time(3) special-relativity(2) speed-of-light(1) steve-bryant(1) thermodynamics(6) time(10) time(1) universe(1) video-conference-live(2) video-lecture(1) videos(3) vote(2) wave-particle-duality(4) website(1) youtube(1)

---

mathematics

	Euclide's Mistakes 2018-06-21 by John-Erik Persson The fifth postulate In Euclid's geometry, regarding a plane, he uses the concepts point and straight line. He postulates, that a point and a straight line together can define a unique straight line, parallel to the given line and passing through the given point. However, he never provided

	Euclid Was Wrong 2015-08-12 by John-Erik Persson An earlier contribution from this author was called The Definition of Parallelism. The article stated that the definition of parallelism in Euclidean geometry is wrong. The motivat