Abstract:Solving tangle equations is deeply connected with studying enzyme action on DNA. The main goal of this paper is to solve the system of tangle equations [Formula: see text] and [Formula: see text], where [Formula: see text] and [Formula: see text] are rational tangles, and [Formula: see text] is a 2-bridge link, for [Formula: see text], with [Formula: see text] and [Formula: see text] nontrivial. We solve this system of equations under the assumption [Formula: see text], the double branched cover of [Formula: s… Show more
“…The link L 2 is observable in the experiment. Since tangles T 1 and T 2 are known, DNA recombination processes lead to systems (1.1), where X is the unknown (see, e.g., [1,5,8,9,11,38,39,43,44] for further discussion of such systems).…”
We study systems of two-tangle equations
$$ \begin{align*}\begin{cases} N(X+T_1)=L_1,\\ N(X+T_2)=L_2, \end{cases}\end{align*} $$
which play an important role in the analysis of enzyme actions on DNA strands.
We show that every system of framed tangle equations has at most one-framed rational solution. Furthermore, we show that the Jones unknot conjecture implies that if a system of tangle equations has a rational solution, then that solution is unique among all two-tangles. This result potentially opens a door to a purely topological disproof of the Jones unknot conjecture.
We introduce the notion of the Kauffman bracket ratio
$\{T\}_q\in \mathbb Q(q)$
of any two-tangle T and we conjecture that for
$q=1$
it is the slope of meridionally incompressible surfaces in
$D^3-T$
. We prove that conjecture for algebraic T. We also prove that for rational T, the brackets
$\{T\}_q$
coincide with the q-rationals of Morier-Genoud and Ovsienko.
Additionally, we relate systems of tangle equations to the cosmetic surgery conjecture and the nugatory crossing conjecture.
“…The link L 2 is observable in the experiment. Since tangles T 1 and T 2 are known, DNA recombination processes lead to systems (1.1), where X is the unknown (see, e.g., [1,5,8,9,11,38,39,43,44] for further discussion of such systems).…”
We study systems of two-tangle equations
$$ \begin{align*}\begin{cases} N(X+T_1)=L_1,\\ N(X+T_2)=L_2, \end{cases}\end{align*} $$
which play an important role in the analysis of enzyme actions on DNA strands.
We show that every system of framed tangle equations has at most one-framed rational solution. Furthermore, we show that the Jones unknot conjecture implies that if a system of tangle equations has a rational solution, then that solution is unique among all two-tangles. This result potentially opens a door to a purely topological disproof of the Jones unknot conjecture.
We introduce the notion of the Kauffman bracket ratio
$\{T\}_q\in \mathbb Q(q)$
of any two-tangle T and we conjecture that for
$q=1$
it is the slope of meridionally incompressible surfaces in
$D^3-T$
. We prove that conjecture for algebraic T. We also prove that for rational T, the brackets
$\{T\}_q$
coincide with the q-rationals of Morier-Genoud and Ovsienko.
Additionally, we relate systems of tangle equations to the cosmetic surgery conjecture and the nugatory crossing conjecture.
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