Constructing group actions on quasi-trees – Koji Fujiwara – ICM2018
Topology Invited Lecture 6.12 Constructing group actions on quasi-trees Koji Fujiwara Abstract: A quasi-tree is a geodesic metric space quasi-isometric to a tree. We give a general construction of many actions of groups on quasi-trees. The groups we can handle include non-elementary hype
From playlist Topology
Jean Michel : Quasisemisimple classes
Abstract: This is a report on joint work with François Digne. Quasisemisimple elements are a generalisation of semisimple elements to disconnected reductive groups (or equivalently, to algebraic automorphisms of reductive groups). In the setting of reductive groups over an algebraically c
From playlist Lie Theory and Generalizations
Abstract Algebra: We define the notion of a subgroup and provide various examples. We also consider cyclic subgroups and subgroups generated by subsets in a given group G. Example include A4 and D8. U.Reddit course materials available at http://ureddit.com/class/23794/intro-to-group-
From playlist Abstract Algebra
Schemes 27: Quasicoherent sheaves
This lecture is part of an online algebraic geometry course on schemes, based on chapter II of "Algebraic geometry" by Hartshorne. We show how to turn a module over a ring into a sheaf of modules over its spectrum. A quasicoherent sheaf of modules of one which looks locally like one constr
From playlist Algebraic geometry II: Schemes
What is a Group? | Abstract Algebra
Welcome to group theory! In today's lesson we'll be going over the definition of a group. We'll see the four group axioms in action with some examples, and some non-examples as well which violate the axioms and are thus not groups. In a fundamental way, groups are structures built from s
From playlist Abstract Algebra
Abstract Algebra | Cyclic Subgroups
We define the notion of a cyclic subgroup and give a few examples. http://www.michael-penn.net http://www.randolphcollege.edu/mathematics/
From playlist Abstract Algebra
Joachim Cuntz: Semigroup C*-algebras and toric varieties
The lecture was held within the framework of the Hausdorff Trimester Program: K-Theory and Related Fields. The coordinate ring of a toric variety is the semigroup ring of a finitely generated subsemigroup of Zn. Such semigroups have the interesting feature that their family of constructib
From playlist HIM Lectures: Trimester Program "K-Theory and Related Fields"
Dihedral Group (Abstract Algebra)
The Dihedral Group is a classic finite group from abstract algebra. It is a non abelian groups (non commutative), and it is the group of symmetries of a regular polygon. This group is easy to work with computationally, and provides a great example of one connection between groups and geo
From playlist Abstract Algebra
Numerical mathematics of quasicrystals – Pingwen Zhang – ICM2018
Numerical Analysis and Scientific Computing Invited Lecture 15.8 Numerical mathematics of quasicrystals Pingwen Zhang Abstract: Quasicrystals are one kind of fascinating aperiodic structures, and give a strong impact on material science, solid state chemistry, condensed matter physics an
From playlist Numerical Analysis and Scientific Computing
CCHF-VS 2.2 | Prof. Hartwig: Catalytic Functionalization of C–H Bonds with Main Group Reagents
Prof. John Hartwig from UC-Berkeley presents his groups work on the functionalization of C–H bonds with main group reagents. This was part of the second Center for Selective C–H Functionalization Virtual Symposium
From playlist CCHF Virtual Symposia
CCHF VS 16.3 - Prof. Debabrata Maiti
Prof. Deb Maiti from IIT Bombay presents on palladium- and rhodium-catalyzed distal C-H functionalization.
From playlist CCHF Virtual Symposia
Synthesis Workshop: Meta-selective C-H Borylation with Dr. Tyler Pabst (Episode 106)
In this Research Spotlight episode, Dr. Tyler Pabst (alumnus of Chirik group at Princeton) joins us to share his work on meta-selective C-H borylation reactions enabled by cobalt catalysis. Key references: Organometallics 2021, 40, 813-831. https://doi.org/10.1021/acs.organomet.1c00030 J.
From playlist Special Topics: Organometallics
Learn how to crochet these darling snowflake ornaments! They look much more complicated than they really are. Only 5 rounds. Quite easy and they are a breeze to whip up! Make them for gifts, attach them to other gifts or simply crochet some up for friends and family. Finish them by starchi
From playlist Crochet!
CCHF VS 4.3 | Prof. Davies: Catalyst-Controlled Functionalization of Unactivated C–H Bonds
Prof. Huw Davies, from Emory University, presents on Catalyst-Controlled Functionalization of Unactivated C–H Bonds
From playlist CCHF Virtual Symposia
Condensed structures | Structure and bonding | Organic chemistry | Khan Academy
How to go from Lewis dot structures to partially condensed structures to condensed structures. Watch the next lesson: https://www.khanacademy.org/science/organic-chemistry/gen-chem-review/bond-line-structures/v/bond-line-structures-new?utm_source=YT&utm_medium=Desc&utm_campaign=organicche
From playlist Structure and bonding | Organic Chemistry | Khan Academy
The US Marine CH-53K King Stallion Helicopter is Worthy of Its Name
The Sikorsky CH-53K King Stallion heavy-lift helicopter has passed the initial operational test and evaluation phase of its development ahead of its entry into service in 2022. Join our YouTube channel by clicking here: https://bit.ly/3asNo2n Find us on Instagram: https://bit.ly/3PM21xW F
From playlist Military Mechanics
Made by Benjamin Azmon IR video https://youtu.be/47cGchDSMdA
From playlist 333L OChem 1
5G Explained: CORESET and PDCCH in 5G NR
View the full playlist here: https://www.youtube.com/playlist?list=PLn8PRpmsu08rCL-Ejn25HMX6M6o7QjJoe Explore the concept of control resource sets (CORESETs) and how it applies to downlink control information. The video looks at the time and frequency structure of a CORESET, and its role i
From playlist 5G Explained
Definition of a group Lesson 24
In this video we take our first look at the definition of a group. It is basically a set of elements and the operation defined on them. If this set of elements and the operation defined on them obey the properties of closure and associativity, and if one of the elements is the identity el
From playlist Abstract algebra