Knots (knot theory)

Stuck unknot

In mathematics, a stuck unknot is a closed polygonal chain that is topologically equal to the unknot but cannot be deformed to a simple polygon by rigid motions of the segments.Similarly a stuck open chain is an open polygonal chain such that the segments may not be aligned by moving rigidly its segments. Topologically such a chain can be unknotted, but the limitation of using only rigid motions of the segments can create nontrivial knots in such a chain. Consideration of such "stuck" configurations arises in the study of molecular chains in biochemistry. (Wikipedia).

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4 Banned Commercials!!

Outrageously funny!!!

From playlist Advertisements

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When You Feel Stuck in a Relationship

This is a film about being stuck in a relationship - neither happily being able to stay nor freely being able to move on. Why do we find it so hard to move forward? Where does the feeling of being stuck come from, and what might we do to overcome it? Sign up to our new newsletter and get

From playlist RELATIONSHIPS

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On Feeling Stuck

Many of us feel ‘stuck’ - wishing we could escape a job or relationship, while being incapable of doing so. Coming unstuck involves examining unhelpful messages we internalised in childhood. Sign up to our mailing list to receive 10% off your first order with us: https://r1.dotdigital-pag

From playlist SELF

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Now You Know: Bursting Balloons

When you stick a needle in a balloon, the rubber tears—the balloon pops. But high-speed video reveals the details, and there are some surprises to be had. How does the rubber unzip as it tears? It’s different for a round balloon and a longer balloon-animal balloon. And if the balloon is fi

From playlist Now You Know

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Outtakes

Yes. I make mistakes ... rarely. http://www.flippingphysics.com

From playlist Miscellaneous

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What is particle physics?

Subscribe to our YouTube Channel for all the latest from World Science U. Visit our Website: http://www.worldscienceu.com/ Like us on Facebook: https://www.facebook.com/worldscienceu Follow us on Twitter: https://twitter.com/worldscienceu

From playlist Science Unplugged: Particle Physics

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Legendrian Torus and Cable Links - Lisa Traynor

Joint IAS/Princeton University Symplectic Geometry Seminar Topic: Legendrian Torus and Cable Links Speaker: Lisa Traynor Affiliation: Bryn Mawr College Date: November 22, 2021 Legendrian torus knots were classified by Etnyre and Honda. I will explain the classification of Legendrian toru

From playlist Mathematics

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Shopping Cart Truck Mishap

I guess this is what happens when you don't put anything up to keep the shopping carts from falling out of the truck.

From playlist Inertia

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Nicholas Cazet: Surface-link Families with Arbitrarily Large Triple Point Number

Nicholas Cazet, UC Davis Title: Surface-link Families with Arbitrarily Large Triple Point Number Analogous to a classical knot diagram, a surface-knot can be generically projected to 3-space and given crossing information to create a broken sheet diagram. A generic compact surface in 3-spa

From playlist 39th Annual Geometric Topology Workshop (Online), June 6-8, 2022

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Joel Hass - Lecture 1 - Algorithms and complexity in the theory of knots and manifolds - 18/06/18

School on Low-Dimensional Geometry and Topology: Discrete and Algorithmic Aspects (http://geomschool2018.univ-mlv.fr/) Joel Hass (University of California at Davis, USA) Algorithms and complexity in the theory of knots and manifolds Abstract: These lectures will introduce algorithmic pro

From playlist Joel Hass - School on Low-Dimensional Geometry and Topology: Discrete and Algorithmic Aspects

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Joel Hass - Lecture 3 - Algorithms and complexity in the theory of knots and manifolds - 20/06/18

School on Low-Dimensional Geometry and Topology: Discrete and Algorithmic Aspects (http://geomschool2018.univ-mlv.fr/) Joel Hass (University of California at Davis, USA) Algorithms and complexity in the theory of knots and manifolds Abstract: These lectures will introduce algorithmic pro

From playlist Joel Hass - School on Low-Dimensional Geometry and Topology: Discrete and Algorithmic Aspects

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Joel Hass - Lecture 4 - Algorithms and complexity in the theory of knots and manifolds - 21/06/18

School on Low-Dimensional Geometry and Topology: Discrete and Algorithmic Aspects (http://geomschool2018.univ-mlv.fr/) Joel Hass (University of California at Davis, USA) Algorithms and complexity in the theory of knots and manifolds Abstract: These lectures will introduce algorithmic pro

From playlist Joel Hass - School on Low-Dimensional Geometry and Topology: Discrete and Algorithmic Aspects

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Why do shoelaces untie themselves?

Failure to stay knotty is a two-stage process according to a new study of lace mechanics. Learn more: http://scim.ag/2oVypF9

From playlist Materials and technology

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Unicycle Jenga

Because some people didn't believe me...

From playlist My Other Videos

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Paul Turner: A hitchhiker's guide to Khovanov homology - Part I

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 Geometry

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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

From playlist Summer of Math Exposition Youtube Videos

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Knots in disguise

Trefoil disguises: http://shpws.me/Tk5w Unknot disguises: http://shpws.me/Tk5e The idea to make optical illusions with knots came from a project one of my students, Austin Elliott, did for the "3D printing and math" class I teach at Oklahoma State. In Austin's design the knot could cast s

From playlist Illusions

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Knotty Problems - Marc Lackenby

Knots are a familiar part of everyday life, for example tying your tie or doing up your shoe laces. They play a role in numerous physical and biological phenomena, such as the untangling of DNA when it replicates. However, knot theory is also a well-developed branch of pure mathematics.

From playlist Oxford Mathematics Public Lectures

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呼叫魚

好恐佈,咁都食得落口

From playlist Crazy Stuff

Related pages

Simple polygon | Mathematics | Polygonal chain