Spherical geometry | Circle packing
In geometry, the Tammes problem is a problem in packing a given number of circles on the surface of a sphere such that the minimum distance between circles is maximized. It is named after the Dutch botanist Pieter Merkus Lambertus Tammes (the nephew of pioneering botanist Jantina Tammes) who posed the problem in his 1930 doctoral dissertation on the distribution of pores on pollen grains. Mathematicians independent of Tammes began studying circle packing on the sphere in the early 1940s; it was not until twenty years later that the problem became associated with his name. It can be viewed as a particular special case of the generalized Thomson problem of minimizing the total Coulomb force of electrons in a spherical arrangement. Thus far, solutions have been proven only for small numbers of circles: 3 through 14, and 24. There are conjectured solutions for many other cases, including those in higher dimensions. (Wikipedia).
GTAC 2009 - Fighting Layout Bugs
Google Tech Talk October 21, 2009 ABSTRACT Presented by Michael Tamm, optivo GmbH at the 4th Annual Google Test Automation Conference, October 21st, 22nd, 2009, Zurich, CH So you have unit tests, integration tests, and maybe even frontend tests, and you know that your web applica
From playlist GTAC 2009
Bearings and Trigonometry problem solving
Challenging A - A* bearings questions incorporating problem solving, angle facts and trigonometry.
From playlist bearings
GeoGebra Link: https://www.geogebra.org/m/yvqwqk6h
From playlist Geometry: Challenge Problems
How does Cerenkov radiation work?
The behavior of matter can constantly amaze people, especially when extreme conditions are involved. In this video, Fermilab’s Dr. Don Lincoln describes what happens when a charged particle travels through a transparent material faster than light travels through that same material. When
From playlist Videos by Don Lincoln
Maximum modulus principle In this video, I talk about the maximum modulus principle, which says that the maximum of the modulus of a complex function is attained on the boundary. I also show that the same thing is true for the real and imaginary parts, and finally I discuss the strong max
From playlist Complex Analysis
Georg Tamme: On excision in algebraic K-theory
The lecture was held within the framework of the Hausdorff Trimester Program: K-Theory and Related Fields. Georg Tamme: On excision in algebraic K-theory Abstract: I will present a new and direct proof of a result of Suslin saying that any Tor-unital ring satisfies excision in algebraic
From playlist HIM Lectures: Trimester Program "K-Theory and Related Fields"
Why You Think You Might Have ADHD
Most people experience many symptoms of ADHD to some degree, and one of the most well known is the inability to stay focused. However, there are other less common symptoms of ADHD that people often struggle with. In this episode on ADHD, Julian describes these other symptoms and how they c
From playlist Seeker+
GeoGebra Link: https://www.geogebra.org/m/ketkkfuj
From playlist Geometry: Challenge Problems
Kernel Recipes 2015 - How to choose a kernel for your products? - by Willy Tarreau
It’s often difficult to select a kernel for products that are shipped to customers. Several branches exist, bugs need to be avoided as much as possible and updates must be rare enough not to upset customers. All this must be true during all the product’s lifecycle. This presentation will s
From playlist Kernel Recipes 2015
IB Chemistry Topic 5 Energetics 5.1 Measuring energy changes with Q=mcdT
IB Chemistry Topic 5 Energetics 5.1 Measuring energy changes with Q=mcdT The difference between temperature and heat, how to draw enthalpy diagrams. How to measure heat change Q and determine the enthalpy of a reaction using calorimetry and Q=mcdT with practice problems For full resources
From playlist Topic 5/15 Energetics and thermochemistry
Astrophysical Plasma (Lecture - 07) by Professor G Srinivasan
Summer course 2018 - A Random walk in astro-physics Lecture - 07 : Astrophysical Plasma by Professor G Srinivasan, Raman Research Institute (Retired) 10.00 to 12.00 Friday, 18 May 2018 Madhava Lecture Hall, ICTS Bangalore The range of densities, temperatures, magnetic fields, etc. that
From playlist Summer Course 2018: A Random Walk In Astro-physics
Researchers are experimenting with CRISPR, a powerful tool that can alter the DNA of humans. The implications have scientists excited, but nervous. Click here for the full story: http://www.cbc.ca/1.3339346 »»» Subscribe to The National to watch more videos here: https://www.youtube.com
From playlist CRISPR
Here, the scene we New Englanders desperately miss this time of year. #Math Ts: What can your Ss create using #Desmos? https://desmos.com/calculator/eorincufok #FunWithDesmos
From playlist Desmos Activities, Illustrations, and How-To's
Moritz Kerz: Algebraic K-theory and descent for blow-ups (Lecture 2)
The lecture was held within the framework of the Hausdorff Trimester Program: K-Theory and Related Fields. Moritz Kerz: Algebraic K-theory and descent for blow-ups Abstract: It is well-known that special cases of descent along blow-ups for algebraic K-theory play an important role for ca
From playlist HIM Lectures: Trimester Program "K-Theory and Related Fields"
Desmos Marbleslides Exponentials Challenge 2
In this video, we look at the second challenge of the desmos marbleslides exponential activity. #desmos #marbleslides
From playlist Desmos Exponents Marbleslides Fix it
Eddie Chumney in Finland 2012-05-05 PART 2/8
Eddie Chumney is one of the leading Torah teachers in the Hebraic Roots community of Messianic bible-believers today. We had the privilege and honor to have him as a guest in Finland in May 2012, and we organized a few meetings for him to speak in about Hebraic Roots of Christianity. I wil
From playlist Eddie Chumney @ Finland/Suomi @ 2012/5
How Is the ADHD Brain Different?
If you’re online, you may notice that conversations around ADHD are everywhere. You may even be starting to wonder, as you flick from one app to the next, that you yourself may have ADHD. So in Part 1 of this series about ADHD, Julian explores what this disorder is, what’s happening in the
From playlist Seeker+
Moritz Kerz: Algebraic K-theory and descent for blow-ups (Lecture 1)
The lecture was held within the framework of the Hausdorff Trimester Program: K-Theory and Related Fields. Moritz Kerz: Algebraic K-theory and descent for blow-ups Abstract: It is well-known that special cases of descent along blow-ups for algebraic K-theory play an important role for ca
From playlist HIM Lectures: Trimester Program "K-Theory and Related Fields"