In graph theory, a strong coloring, with respect to a partition of the vertices into (disjoint) subsets of equal sizes, is a (proper) vertex coloring in which every color appears exactly once in every part. A graph is strongly k-colorable if, for each partition of the vertices into sets of size k, it admits a strong coloring. When the order of the graph G is not divisible by k, we add isolated vertices to G just enough to make the order of the new graph G′ divisible by k. In that case, a strong coloring of G′ minus the previously added isolated vertices is considered a strong coloring of G. The strong chromatic number sχ(G) of a graph G is the least k such that G is strongly k-colorable.A graph is strongly k-chromatic if it has strong chromatic number k. Some properties of sχ(G): 1. * sχ(G) > Δ(G). 2. * sχ(G) ≤ 3 Δ(G) − 1. 3. * Asymptotically, sχ(G) ≤ 11 Δ(G) / 4 + o(Δ(G)). Here, Δ(G) is the maximum degree. Strong chromatic number was independently introduced by Alon (1988) and Fellows (1990). (Wikipedia).
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From playlist Chemistry
Beginning Graphic Design: Color
In this video, you’ll learn the basics of using color in graphic design. Visit https://www.gcflearnfree.org/beginning-graphic-design/color/1/ for our text-based lesson. This video includes information on: • Hue, saturation, and value • Creating monochromatic, analogous, and other color sc
From playlist Graphic Design
The power and science of color. How color influences your daily lifestyle. This video sponsored by L'OREAL. https://www.linkedin.com/company/1662/careers?sid=15&success=true L'Oréal Check out the L'OREAL research page on linkedIn and discover the science of beauty: they are hiring in more
From playlist Best of GreenPowerScience
IB Strong and Weak Acids and bases
IB SL Chemistry lesson on strong and weak acids and bases
From playlist IB Chemistry
Calculating the pH of a weak acid More free lessons at: http://www.khanacademy.org/video?v=dencuBNp_Ck
From playlist Chemistry
Chemistry - Acids & Bases Fundamentals (21 of 35) What Is A Strong Acid?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain "What is a strong acid?" (A "strong" acid is "weak".)
From playlist CHEMISTRY 22 ACIDS AND BASES
Strong and Weak Alkali's | Acids, Bases & Alkali's | Chemistry | FuseSchool
An acid is a substance that will dissociate in water to give a proton (or H+ ion) and a conjugate base. An acid is considered to be strong if dissociation nears 100%, and weak if dissociation is usually less than 1%. In this lesson, we will learn about strong alkalis and weak alkalis.
From playlist CHEMISTRY: Acids, Bases & Alkalis
Is Black Really Black? - Filter Paper
Order now at http://www.stevespanglerscience.com/product/1144 Perform an amazing experiment in color separation with a water-soluble black pen, a pipe cleaner and a round piece of filter paper. There's a rainbow of color in just one black dot! Perform an amazing experiment in color separat
From playlist Steve on the News
Here's Why Scientists Are Coloring Birds’ Heads With Markers | National Geographic
How do golden-crowned sparrows judge their competition? Previous studies found the patches of yellow plumage on sparrows are indicators of fighting ability. Birds with a bold-colored crown feathers were more dominant than birds with duller colors. When scientists painted bold coloring onto
From playlist News | National Geographic
IB HL Chemistry lesson on pH curves, buffers, and indicator ranges
From playlist IB Chemistry
Natasha Dobrinen: Borel sets of Rado graphs are Ramsey
The Galvin-Prikry theorem states that Borel partitions of the Baire space are Ramsey. Thus, given any Borel subset $\chi$ of the Baire space and an infinite set $N$, there is an infinite subset $M$ of $N$ such that $\left [M \right ]^{\omega }$ is either contained in $\chi$ or disjoint fr
From playlist Combinatorics
IB HL Chemistry Acids and bases Topic 18.3 pH curves - buffers and titrations HL
IB HL Chemistry Acids and bases Topic 18.3 pH curves - buffers and titrations IB HL Chemistry acids and bases component. A detailed look at how buffers work including their calculations and titration curves. Titration curves of a combination of strong/weak acid/base are to be understood.
From playlist Topic 8/18 Acids and bases
28. Transition Metals: Crystal Field Theory Part I
MIT 5.111 Principles of Chemical Science, Fall 2014 View the complete course: https://ocw.mit.edu/5-111F14 Instructor: Catherine Drennan Crystal field theory was developed to explain the special features of transition metal complexes, including their beautiful colors and their magnetic pr
From playlist MIT 5.111 Principles of Chemical Science, Fall 2014
The math of how atomic nuclei stay together is surprisingly beautiful | Full movie #SoME2
How does the nucleus of an atom stay together? Animations and editing by Abhigyan Hazarika Abhigyan's LinkedIn: https://www.linkedin.com/in/abhigyan-hazarika-6460801b8/ Script and narration by Fernando Franco Félix This is our submission to the Summer of Math Exposition: https://www.you
From playlist Summer of Math Exposition 2 videos
What Makes The Strong Force Strong?
Check Out The Bigger Picture: https://www.youtube.com/watch?v=Wnr4RJxDifw PBS Member Stations rely on viewers like you. To support your local station, go to:http://to.pbs.org/DonateSPACE Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Qua
From playlist The Standard Model Lagrangian Playlist
Strong Interaction: The Four Fundamental Forces of Physics #1a
Part one of a four part series on the fundamental forces (or interactions) of physics begins with the strong force or strong interaction - which on the small scale holds quarks together to form protons, neutrons and other hadron particles. Hosted by: Hank Green ---------- SciShow has a sp
From playlist Uploads
Titration curves and acid-base indicators | Chemistry | Khan Academy
Choosing the best indicator for different titrations depending on the pH at the equivalence point. Created by Jay. Watch the next lesson: https://www.khanacademy.org/science/chemistry/acid-base-equilibrium/titrations/v/titration-roundup?utm_source=YT&utm_medium=Desc&utm_campaign=chemistr
From playlist Buffers, titrations, and solubility equilibria | Chemistry | Khan Academy
23. Acid-Base Titrations Part I
MIT 5.111 Principles of Chemical Science, Fall 2014 View the complete course: https://ocw.mit.edu/5-111F14 Instructor: Catherine Drennan A common chemistry laboratory experiment involves titrating a strong base into a weak acid, drop by drop, until a color change of an indicator dye tells
From playlist MIT 5.111 Principles of Chemical Science, Fall 2014
Why & How do the 4 fundamental forces of nature work?
Get MagellanTV here: https://try.magellantv.com/arvinash and get an exclusive offer for our viewers: an extended, month-long trial, FREE. MagellanTV has the largest and best collection of Science content anywhere, including Space, Physics, Technology, Nature, Mind and Body, and a growing
From playlist FSAS Quantenobjekten
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From playlist Be Smart - LATEST EPISODES!