Exact solutions in general relativity | Differential geometry | Tensors in general relativity
In differential geometry and theoretical physics, the Petrov classification (also known as Petrov–Pirani–Penrose classification) describes the possible algebraic symmetries of the Weyl tensor at each event in a Lorentzian manifold. It is most often applied in studying exact solutions of Einstein's field equations, but strictly speaking the classification is a theorem in pure mathematics applying to any Lorentzian manifold, independent of any physical interpretation. The classification was found in 1954 by A. Z. Petrov and independently by Felix Pirani in 1957. (Wikipedia).
Борис Н. Петров - Boris N. Petrov: Space Pioneer, Automatic Control Engineer(USSR)
The life of automatic control engineer Boris N. Petrov, a pioneer of the Russian space program. Борис Н. Петров Solved automatic control issues in rockets and ballistic missiles, He published many papers on control science with Vladislav Rutkovsky who narrates the story of his life. Leade
From playlist Russian Engineering
Союз - Аполлон / Space: Apollo-Soyuz Leader Boris Petrov
Control engineer Boris N. Petrov was the leader on the Russian side of the Apollo-Soyuz Program 1975. His work included solving fuel consumption problems for rockets and a myriad of other technical issues. The Edison Tech Center interviewed Vladislav Rutkovsky - living pioneer in Russian
From playlist Russian Engineering
From playlist Dimensions Russian / Pусский
How One Man Stopped World War 3 In 1983
On September 26, 1983, life on planet Earth almost came to an end in a Nuclear war. World War 3. One man, Stanislav Petrov prevented this outcome. This is the story of how it happened. --- About ColdFusion --- ColdFusion is an Australian based online media company independently run by Dag
From playlist All My Videos
Matthias Aschenbrenner: The algebra and model theory of transseries
Find this video and other talks given by worldwide mathematicians on CIRM's Audiovisual Mathematics Library: http://library.cirm-math.fr. And discover all its functionalities: - Chapter markers and keywords to watch the parts of your choice in the video - Videos enriched with abstracts, b
From playlist Jean-Morlet Chair - Hauser/Rond
From playlist Contributed talks One World Symposium 2020
Lars Andersson - Geometry and analysis in black hole spacetimes (Part 2)
Black holes play a central role in general relativity and astrophysics. The problem of proving the dynamical stability of the Kerr black hole spacetime, which is describes a rotating black hole in vacuum, is one of the most important open problems in general relativity. Following a brief i
From playlist Ecole d'été 2014 - Analyse asymptotique en relativité générale
Volodymyr Zelenskiy vs Vladimir Putin | Short Essay
Essay on how different Ukrainian president Volodymyr Zelenskiy from Russian president Vladimir Putin. Support independent research and analysis by joining my Patreon page: https://www.patreon.com/thehatedone Russia’s invasion in Ukraine is a self-centered ambition of an authoritarian lea
From playlist Analyses
From playlist Contributed talks One World Symposium 2020
International Relations 101 (#67): Nuclear Pessimism
http://gametheory101.com/courses/international-relations-101/ Nuclear weapons have their downsides. What are they? Do they outweigh the positives? Here's a link to Atomic Audit: http://www.amazon.com/gp/product/0815777736/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=081
From playlist William Spaniel: International Relations 101
Bhargav Bhatt - Prismatic cohomology and applications: Crystals
February 18, 2022 - This is the second in a series of three Minerva Lectures. Prismatic cohomology is a recently discovered cohomology theory for algebraic varieties over p-adically complete rings. In these lectures, I will give an introduction to this notion with an emphasis on applicati
From playlist Minerva Lectures - Bhargav Bhatt
100 Seconds to Midnight - https://aperture.gg/seconds Bulletin of the Atomic Scientists: https://thebulletin.org/ Merch: https://aperture.gg/merch Stay connected with Aperture: Website: https://aperture.gg/ Instagram: https://www.instagram.com/theapertureyt/ Twitter: https://twitter.com/
From playlist Science & Technology 🚀
Classification results for two-dimensional Lagrangian tori - Dimitroglou Rizell
Princeton/IAS Symplectic Geometry Seminar Topic: Classification results for two-dimensional Lagrangian tori Speaker: Georgios Dimitroglou-Rizell Date: Thursday, April 7 We present several classification results for Lagrangian tori, all proven using the splitting construction from symp
From playlist Mathematics