Vectors (mathematics and physics) | Polytopes
In Euclidean geometry, a eutactic star is a geometrical figure in a Euclidean space. A star is a figure consisting of any number of opposing pairs of vectors (or arms) issuing from a central origin. A star is eutactic if it is the orthogonal projection of plus and minus the set of standard basis vectors (i.e., the vertices of a cross-polytope) from a higher-dimensional space onto a subspace. Such stars were called "eutactic" – meaning "well-situated" or "well-arranged" – by , p. 134) because, for a common scalar multiple, their vectors are projections of an orthonormal basis. (Wikipedia).
From playlist 'Sleeping Sun' videos.
Renaud COULANGEON - Lattices, Perfects lattices, Voronoi reduction theory, modular forms, ... 1
Lattices, Perfects lattices, Voronoi reduction theory, modular forms, computations of isometries and automorphisms The talks of Coulangeon will introduce the notion of perfect, eutactic and extreme lattices and the Voronoi's algorithm to enumerate perfect lattices (both Eulcidean and He
From playlist École d'Été 2022 - Cohomology Geometry and Explicit Number Theory
Gabriele NEBE - Lattices, Perfects lattices, Voronoi reduction theory, modular forms, ...
Lattices, Perfects lattices, Voronoi reduction theory, modular forms, computations of isometries and automorphisms The talks of Coulangeon will introduce the notion of perfect, eutactic and extreme lattices and the Voronoi's algorithm to enumerate perfect lattices (both Eulcidean and He
From playlist École d'Été 2022 - Cohomology Geometry and Explicit Number Theory
From playlist 'Sleeping Sun' videos.
Quadratic forms and Hermite constant, reduction theory by Radhika Ganapathy
Discussion Meeting Sphere Packing ORGANIZERS: Mahesh Kakde and E.K. Narayanan DATE: 31 October 2019 to 06 November 2019 VENUE: Madhava Lecture Hall, ICTS Bangalore Sphere packing is a centuries-old problem in geometry, with many connections to other branches of mathematics (number the
From playlist Sphere Packing - 2019
Renaud COULANGEON - Lattices, Perfects lattices, Voronoi reduction theory, modular forms, ... 2
The talks of Coulangeon will introduce the notion of perfect, eutactic and extreme lattices and the Voronoi's algorithm to enumerate perfect lattices (both Eulcidean and Hermitian). The talk of Nebe will build upon these notions, introduce Boris Venkov's notion of strongly perfect lattic
From playlist École d'Été 2022 - Cohomology Geometry and Explicit Number Theory
Seminar on Applied Geometry and Algebra (SIAM SAGA): Dustin Mixon
Title: Packing Points in Projective Spaces Speaker: Dustin Mixon Date: Tuesday, March 8, 2022 at 11:00am Eastern Abstract: Given a compact metric space, it is natural to ask how to arrange a given number of points so that the minimum distance is maximized. For example, the setting of the
From playlist Seminar on Applied Geometry and Algebra (SIAM SAGA)
Titanic & Britannic Sleeping Sun
Here is the RMS Titanic and HMHS Britannic. Hope you enjoy!!
From playlist 'Sleeping Sun' videos.
Homenagem ao HMHS Britannic Musica: Nightwish Sleeping sun
From playlist 'Sleeping Sun' videos.
Astronomy - Ch. 24: Variable Stars (1 of 26) Variable Star Types
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 We will learn that a variable star is a star whose “apparent brightness” changes or fluctuates over time a seen from Earth. There are
From playlist ASTRONOMY 24 VARIABLE STARS
http://www.teachastronomy.com/ Nearly 2,000 years ago Ptolemy's Almagest, a compendium of astronomical information, contained catalogs of star names. Ancient knowledge was brought to Europe by Arab astronomers who gave names to many of the brightest stars in the sky. The Arab article is
From playlist 14. Stars
Our solar system has just one star in it, the sun. But this is actually not the most common situation for systems. Most systems are multi-star systems, with binary systems being extremely common. These are systems where two stars orbit around their center of mass, and some of them even hav
From playlist Astronomy/Astrophysics
Unusual Or Unexplained Star Phenomena Found in 2021 - 3 Hour Compilation
Good telescope that I've used to learn the basics: https://amzn.to/35r1jAk Get a Wonderful Person shirt: https://teespring.com/stores/whatdamath Alternatively, PayPal donations can be sent here: http://paypal.me/whatdamath Hello and welcome! I'm away for a week moving recording studio to
From playlist Long Science Videos
The Search For Habitable Worlds by Anand Narayanan
COSMIC ZOOM THE SEARCH FOR HABITABLE WORLDS SPEAKER: Anand Narayanan (Astrophysicist, Indian Institute of Space Science and Technology) DATE: 11 April 2021, 19:00 to 20:30 VENUE: Online Abstract: Over the past three decades, tremendous progress has been made in the detection of plane
From playlist Cosmic Zoom
Unusual Or Unexplained Stars We Discovered in 2019 - 2 Hour Compilation
Hello and welcome! I had a bit of a family emergency and have to leave for 3 days, so I made a few more of these videos that were a compilation of biggest discoveries of 2019. Be back soon! PS it's a good king of an emergency, not a bad kind. I wrote a foreword for this awesome Sci-Fi bo
From playlist Long Science Videos
How The Heck Does Gravity Make Stars?!
Episode 1 of 3 Check us out on Soundcloud! https://soundcloud.com/dnewsplus Please Subscribe! http://bit.ly/28iQhYC Discovery GO - http://smart.link/57ae195b47796 Science GO - http://smart.link/57ae1a34dd168 Check out The Great Courses: Sign up today and get a Free Month
From playlist The Life And Death Of Stars
Tuning of Parameters, Order of Magnitude Astrophysics, part 1 - David Spergel
Tuning of Parameters, Order of Magnitude Astrophysics, part 1 David Spergel Princeton University July 22, 2011
From playlist PiTP 2011
Astronomy - Ch. 17: The Nature of Stars (13 of 37) Luminosity and Brightness (Luminosity Defined)
Visit http://ilectureonline.com for more math and science lectures! In this video I will define luminosity as all radiation emitted and brightness as % of energy radiate from visible light. Next video can be seen at: http://youtu.be/zuMrgm1EIpU
From playlist ASTRONOMY 17 STARS AND THE H-R DIAGRAM