Geometric topology | Surfaces | Knot theory
In mathematics, a Seifert surface (named after German mathematician Herbert Seifert) is an orientable surface whose boundary is a given knot or link. Such surfaces can be used to study the properties of the associated knot or link. For example, many knot invariants are most easily calculated using a Seifert surface. Seifert surfaces are also interesting in their own right, and the subject of considerable research. Specifically, let L be a tame oriented knot or link in Euclidean 3-space (or in the 3-sphere). A Seifert surface is a compact, connected, oriented surface S embedded in 3-space whose boundary is L such that the orientation on L is just the induced orientation from S, and every connected component of S has non-empty boundary. Note that any compact, connected, oriented surface with nonempty boundary in Euclidean 3-space is the Seifert surface associated to its boundary link. A single knot or link can have many different inequivalent Seifert surfaces. A Seifert surface must be oriented. It is possible to associate surfaces to knots which are not oriented nor orientable, as well. (Wikipedia).
Here we show a quick way to set up a face in desmos using domain and range restrictions along with sliders. @shaunteaches
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This shows a 3d print of a mathematical sculpture I produced using shapeways.com. This model is available at http://shpws.me/2toQ.
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http://www.shapeways.com/shops/henryseg?section=Surfaces These are joint work with Saul Schleimer.
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Surface Area of Prisms and Pyramids
This video is about finding the Surface Area of Prisms and Pyramids
From playlist Surface Area and Volume
Selenium Tutorial for Beginners - Part 2 | IDE, RC, Webdriver and Grid | Selenium Tutorial | Edureka
( Selenium Training : https://www.edureka.co/testing-with-selenium-webdriver ) Selenium is used for automating Web Applications. It is widely used across all the industries because of its wide range of flexibility with programming languages, operating systems and support for most of the b
From playlist Selenium Tutorial Videos - Automation Testing Tool
Using SED in Linux to manage XML data
More videos like this online at http://www.theurbanpenguin.com
From playlist Learning SUSE Linux
AlgTop23: Knots and surfaces II
In the 1930's H. Siefert showed that any knot can be viewed as the boundary of an orientable surface with boundary, and gave a relatively simple procedure for explicitly constructing such `Seifert surfaces'. We show the algorithm, exhibit it for the trefoil and the square knot, and then di
From playlist Algebraic Topology: a beginner's course - N J Wildberger
Speakers Teresa Brown Mariya Delyakova Lucas Furtado Evan Wickenden Topics discussed Knot definition, Seifert Hypersurfaces, Constructing Seifert Surfaces, Links, The Seifert Matrix, The Alexander Polynomial, Simple (2q-1)Knots, The Genus of a Simple Knot, The Symplectic Group, Classifi
From playlist 2018 Summer REU Presentations
"Illustrating Geometry" exhibition: Artist's talk by Saul Schleimer: "Minimal and Seifert Surfaces"
Slides: http://homepages.warwick.ac.uk/~masgar/Talks/minimal_and_seifert_surfaces.pdf This video is also available at the Simons Center website, at http://scgp.stonybrook.edu/archives/11540 Thanks to Josh Klein for filming and editing.
From playlist 3D printing
Topologically Interesting Felt – Gwen Laura Fisher
A roving of sheep’s wool is a bundle of fiber that has been washed and combed, and perhaps dyed, but not yet spun into yarn. Roving can be turned into soft and flexible felt objects of many varied forms and functions, including topologically interesting surfaces. Examples include Möbius ba
From playlist G4G12 Videos
This shows a set of 3d printed models I produced using shapeways.com. They are available at http://www.shapeways.com/shops/henryseg?section=Calculus+Surfaces. Elliptical cone: z = +- sqrt(2x^2 + y^2) Hyperboloid of one sheet: z = +- sqrt(x^2 + y^2 - 1) Hyperboloid of two sheets: z = +- sq
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Dynamics of Seifert Surfaces of Torus Knots Via ECH - Morgan Weiler
Joint IAS/Princeton University Symplectic Geometry Seminar Topic: Dynamics of Seifert Surfaces of Torus Knots Via ECH Speaker: Morgan Weiler Affiliation: Cornell University Date: March 20, 2023 Embedded contact homology (ECH) is a diffeomorphism invariant of three-manifolds due to Hutchi
From playlist Mathematics
What Is Selenium | Selenium Webdriver Basics | Selenium Tutorial | Selenium Training | Edureka
🔥Edureka Selenium Training: https://www.edureka.co/selenium-certification-training This Edureka video on "What is Selenium" will give you an introduction to automated software testing tool - Selenium. It will give you complete insights into the working and advantages of using Selenium for
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Knots and surfaces II | Algebraic Topology | NJ Wildberger
In the 1930's H. Siefert showed that any knot can be viewed as the boundary of an orientable surface with boundary, and gave a relatively simple procedure for explicitly constructing such `Seifert surfaces'. We show the algorithm, exhibit it for the trefoil and the square knot, and then di
From playlist Algebraic Topology
Duncan McCoy - Lattices, embeddings and Seifert fibered spaces
June 21, 2018 - This talk was part of the 2018 RTG mini-conference Low-dimensional topology and its interactions with symplectic geometry Every Seifert fibered homology sphere bounds a definite star-shaped plumbing. In 1985 Neumann and Zagier used the R-invariant of Fintushel and Stern to
From playlist 2018 RTG mini-conference on low-dimensional topology and its interactions with symplectic geometry I
Do KNOT watch this video! #SoME1
This video is an entry to the 3Blue1Brown, The Summer of Math Exposition, about proving the existence of prime knots and the interesting steps towards the result. Some images produced with SeifertView, Jarke J. van Wijk, Technische Universiteit Eindhoven. Download SeifertView at the link
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Homology Smale-Barden manifolds with K-contact and Sasakian structures by Aleksy Tralle
Higgs bundles URL: http://www.icts.res.in/program/hb2016 DATES: Monday 21 Mar, 2016 - Friday 01 Apr, 2016 VENUE : Madhava Lecture Hall, ICTS Bangalore DESCRIPTION: Higgs bundles arise as solutions to noncompact analog of the Yang-Mills equation. Hitchin showed that irreducible solutio
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How Worm Holes Ended Wormworld
PBS Member Stations rely on viewers like you. To support your local station, go to http://to.pbs.org/DonateEons ↓ More info below ↓ Elongated tubes, flat ribbons, and other “worm-like” body plans were so varied and abundant that a part of the Ediacaran is sometimes known as Wormworld. But
From playlist Ancient Fauna, Flora & Fungi
Page Object Model in Selenium Webdriver | Page Object Model with Page Factory | Edureka
** Selenium Certification Training: https://www.edureka.co/selenium-certification-training ** This Edureka video on Page Object Model in Selenium Webdriver will talk about Page object model fundamentals. It will also tell you about Page factory and its implementation with page object mode
From playlist Selenium Tutorial Videos - Automation Testing Tool