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The quandle homology theory is generalized to the case when the coefficient groups admit the structure of Alexander quandles, by including an action of the infinite cyclic group in the boundary operator. Theories of Alexander extensions of quandles in relation to low dimensional cocycles are developed in parallel to group extension theories for group… (More)

- W Edwin Clark, Mohamed Elhamdadi, Masahico Saito, Timothy Yeatman
- Journal of knot theory and its ramifications
- 2014

We present a set of 26 finite quandles that distinguish (up to reversal and mirror image) by number of colorings, all of the 2977 prime oriented knots with up to 12 crossings. We also show that 1058 of these knots can be distinguished from their mirror images by the number of colorings by quandles from a certain set of 23 finite quandles. We study the… (More)

The groups of link bordism can be identified with homotopy groups via the Pontryagin–Thom construction. B.J. Sanderson computed the bordism group of 3 component surface–links using the Hilton–Milnor Theorem, and later gave a geometric interpretation of the groups in terms of intersections of Seifert hypersurfaces and their framings. In this paper, we… (More)

- Natasa Jonoska, Masahico Saito
- Developments in Language Theory
- 2004

- Angela Angeleska, Natasa Jonoska, Masahico Saito, Laura F Landweber
- Journal of theoretical biology
- 2007

We propose molecular models for homologous DNA recombination events that are guided by either double-stranded RNA (dsRNA) or single-stranded RNA (ssRNA) templates. The models are applied to explain DNA rearrangements in some groups of ciliates, such as Stylonychia or Oxytricha, where extensive gene rearrangement occurs during differentiation of a somatic… (More)

- Natasa Jonoska, Stephen A. Karl, Masahico Saito
- DNA Based Computers
- 1997

We propose solving computational problems with DNA molecules by physically constructing 3-dimensional graph structures. Building blocks consisting of intertwined strands of DNA are used to represent graph edges and vertices. Diierent blocks would be combined to form all possible 3-dimensional structures representing a graph. The solution to the Hamiltonian… (More)

- Natasa Jonoska, Masahico Saito
- DNA
- 2001

- J. SCOTT CARTER, DANIEL JELSOVSKY, SEIICHI KAMADA, LAUREL LANGFORD, MASAHICO SAITO, Walter Neumann
- 1999

State-sum invariants for classical knots and knotted surfaces in 4-space are developed via the cohomology theory of quandles. Cohomology groups of quandles are computed to evaluate the invariants. Some twist spun torus knots are shown to be noninvertible using the invariants.

φ φ φ φ φ φ y p q r x q p r p*q q*r (p*q)*r (p*r)*(q*r) p*r q*r (x, y) (p, q) (q, r) (p*q, r) (p, r) x y 1 T T 0 T 0 T 0-1 T-1 T T-2 1 T T 0 T 0-1 T-1 T-1 T T-2 φ T φ φ T φ φ φ T r p*q q*r (p*q)*r (p*r)*(q*r) p*r (p, q) (q, r) (p*q, r) (p, r) Abstract Three new knot invariants are defined using cocycles of the generalized quandle homology theory that was… (More)

We define self-distributive structures in the categories of coalgebras and cocommutative coalgebras. We obtain examples from vector spaces whose bases are the elements of finite quandles, the direct sum of a Lie algebra with its ground field, and Hopf algebras. The self-distributive operations of these structures provide solutions of the Yang–Baxter… (More)