Results 11 to 20 of about 34,821 (85)

Virtual Knot Cobordism

open access: yes, 2014
This paper defines a theory of cobordism for virtual knots and studies this theory for standard and rotational virtual knots and links. Non-trivial examples of virtual slice knots are given. Determinations of the four-ball genus of positive virtual knots
Kauffman, Louis H.
core   +1 more source

The Theory of Pseudoknots

open access: yes, 2012
Classical knots in $\mathbb{R}^3$ can be represented by diagrams in the plane. These diagrams are formed by curves with a finite number of transverse crossings, where each crossing is decorated to indicate which strand of the knot passes over at that ...
Henrich, Allison   +5 more
core   +1 more source

Knot Probabilities in Random Diagrams

open access: yes, 2015
We consider a natural model of random knotting- choose a knot diagram at random from the finite set of diagrams with n crossings. We tabulate diagrams with 10 and fewer crossings and classify the diagrams by knot type, allowing us to compute exact ...
Cantarella, Jason   +2 more
core   +1 more source

Bridge numbers for virtual and welded knots

open access: yes, 2014
Using Gauss diagrams, one can define the virtual bridge number ${\rm vb}(K)$ and the welded bridge number ${\rm wb}(K),$ invariants of virtual and welded knots with ${\rm wb}(K) \leq {\rm vb}(K).$ If $K$ is a classical knot, Chernov and Manturov showed ...
Boden, Hans U., Gaudreau, Anne Isabel
core   +1 more source

Augmentations and Rulings of Legendrian Knots [PDF]

open access: yes, 2005
A connection between holomorphic and generating family invariants of Legendrian knots is established; namely, that the existence of a ruling (or decomposition) of a Legendrian knot is equivalent to the existence of an augmentation of its contact homology.
Sabloff, Joshua M.
core   +2 more sources

The strength of surgical knots involves a critical interplay between friction and elastoplasticity. [PDF]

open access: yesSci Adv, 2023
Johanns P   +5 more
europepmc   +1 more source

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