I'm doing research into improving the inapproximability ratio for the metric/graphic Traveling Salesman Problem. As I've been reading through the literature in this field, I've noticed that most of the papers rely on relating TSP to related combinatorial optimization problems about finding solutions to as many of a large system of linear equations as possible (like MAX-E3-LIN2). However, none of these articles seem to explain why it is better to work with TSP in this basis, or why the manipulation is useful to demonstrating inapproximability. Can anyone point me to a good book or tutorial review that explains how this technique works (perhaps the first article to employ it would be a good resource, but I haven't been able to locate it!)
2026-03-26 17:46:16.1774547176
Inapproximability research for metric TSP
113 Views Asked by Bumbble Comm https://math.techqa.club/user/bumbble-comm/detail At
1
There are 1 best solutions below
Related Questions in COMBINATORICS
- Using only the digits 2,3,9, how many six-digit numbers can be formed which are divisible by 6?
- The function $f(x)=$ ${b^mx^m}\over(1-bx)^{m+1}$ is a generating function of the sequence $\{a_n\}$. Find the coefficient of $x^n$
- Name of Theorem for Coloring of $\{1, \dots, n\}$
- Hard combinatorial identity: $\sum_{l=0}^p(-1)^l\binom{2l}{l}\binom{k}{p-l}\binom{2k+2l-2p}{k+l-p}^{-1}=4^p\binom{k-1}{p}\binom{2k}{k}^{-1}$
- Algebraic step including finite sum and binomial coefficient
- nth letter of lexicographically ordered substrings
- Count of possible money splits
- Covering vector space over finite field by subspaces
- A certain partition of 28
- Counting argument proof or inductive proof of $F_1 {n \choose1}+...+F_n {n \choose n} = F_{2n}$ where $F_i$ are Fibonacci
Related Questions in GRAPH-THEORY
- characterisation of $2$-connected graphs with no even cycles
- Explanation for the static degree sort algorithm of Deo et al.
- A certain partition of 28
- decomposing a graph in connected components
- Is it true that if a graph is bipartite iff it is class 1 (edge-coloring)?
- Fake induction, can't find flaw, every graph with zero edges is connected
- Triangle-free graph where every pair of nonadjacent vertices has exactly two common neighbors
- Inequality on degrees implies perfect matching
- Proving that no two teams in a tournament win same number of games
- Proving that we can divide a graph to two graphs which induced subgraph is connected on vertices of each one
Related Questions in OPTIMIZATION
- Optimization - If the sum of objective functions are similar, will sum of argmax's be similar
- optimization with strict inequality of variables
- Gradient of Cost Function To Find Matrix Factorization
- Calculation of distance of a point from a curve
- Find all local maxima and minima of $x^2+y^2$ subject to the constraint $x^2+2y=6$. Does $x^2+y^2$ have a global max/min on the same constraint?
- What does it mean to dualize a constraint in the context of Lagrangian relaxation?
- Modified conjugate gradient method to minimise quadratic functional restricted to positive solutions
- Building the model for a Linear Programming Problem
- Maximize the function
- Transform LMI problem into different SDP form
Related Questions in SYSTEMS-OF-EQUATIONS
- Can we find $n$ Pythagorean triples with a common leg for any $n$?
- System of equations with different exponents
- Is the calculated solution, if it exists, unique?
- System of simultaneous equations involving integral part (floor)
- Solving a system of two polynomial equations
- Find all possible solution in Z5 with linear system
- How might we express a second order PDE as a system of first order PDE's?
- Constructing tangent spheres with centers located on vertices of an irregular tetrahedron
- Solve an equation with binary rotation and xor
- Existence of unique limit cycle for $r'=r(μ-r^2), \space θ' = ρ(r^2)$
Related Questions in HAMILTONIAN-PATH
- constraints to the hamiltonian path: can one tell if a path is hamiltonian by looking at it?
- Most efficient way to detect if a series of n edges creates a cycle of size n.
- Is it true that every graph with $n$ vertices in which $\delta(G)\geq\frac{n}{2}-1$ has Hamiltionian path?
- Prove that if a graph $G$ has a Hamilton path then for every $S \subseteq V(G)$ the number of components of $G - S$ is at most $|S| + 1$
- Using Ore's theorem to show the graph contains a Hamilton cycle
- Graph Theory: Hamilton Cycle Definition Clarification
- Does this graph have a Hamiltonian cycle?
- Show the NP completeness of Hamiltonian Path with the knowledge of an directed Euler graph
- Finding Hamiltonian cycle for $N\times M$ grid where $N$ is even
- Graph Theory - Hamiltonian Cycle, Eulerian Trail and Eulerian circuit
Trending Questions
- Induction on the number of equations
- How to convince a math teacher of this simple and obvious fact?
- Find $E[XY|Y+Z=1 ]$
- Refuting the Anti-Cantor Cranks
- What are imaginary numbers?
- Determine the adjoint of $\tilde Q(x)$ for $\tilde Q(x)u:=(Qu)(x)$ where $Q:U→L^2(Ω,ℝ^d$ is a Hilbert-Schmidt operator and $U$ is a Hilbert space
- Why does this innovative method of subtraction from a third grader always work?
- How do we know that the number $1$ is not equal to the number $-1$?
- What are the Implications of having VΩ as a model for a theory?
- Defining a Galois Field based on primitive element versus polynomial?
- Can't find the relationship between two columns of numbers. Please Help
- Is computer science a branch of mathematics?
- Is there a bijection of $\mathbb{R}^n$ with itself such that the forward map is connected but the inverse is not?
- Identification of a quadrilateral as a trapezoid, rectangle, or square
- Generator of inertia group in function field extension
Popular # Hahtags
second-order-logic
numerical-methods
puzzle
logic
probability
number-theory
winding-number
real-analysis
integration
calculus
complex-analysis
sequences-and-series
proof-writing
set-theory
functions
homotopy-theory
elementary-number-theory
ordinary-differential-equations
circles
derivatives
game-theory
definite-integrals
elementary-set-theory
limits
multivariable-calculus
geometry
algebraic-number-theory
proof-verification
partial-derivative
algebra-precalculus
Popular Questions
- What is the integral of 1/x?
- How many squares actually ARE in this picture? Is this a trick question with no right answer?
- Is a matrix multiplied with its transpose something special?
- What is the difference between independent and mutually exclusive events?
- Visually stunning math concepts which are easy to explain
- taylor series of $\ln(1+x)$?
- How to tell if a set of vectors spans a space?
- Calculus question taking derivative to find horizontal tangent line
- How to determine if a function is one-to-one?
- Determine if vectors are linearly independent
- What does it mean to have a determinant equal to zero?
- Is this Batman equation for real?
- How to find perpendicular vector to another vector?
- How to find mean and median from histogram
- How many sides does a circle have?
The connection between the Traveling Salesman Problem (TSP) and linear equations arises from the use of linear programming relaxations and semidefinite programming relaxations for approximating the TSP. These relaxations provide a way to obtain lower bounds on the optimal TSP tour length.
The connection between TSP and linear equations is typically established through the use of the Held-Karp relaxation, also known as the subtour elimination LP relaxation. This relaxation is obtained by relaxing the integer constraints of the TSP formulation and formulating it as a linear programming problem. The solution to this relaxation provides a lower bound on the optimal TSP tour length.
while these dont directly explain the technique advantages or superiority they could be a decent reference with far greater insights than I can put together.
Approximation Algorithms by Vijay V. Vazirani
The Design of Approximation Algorithms by David P. Williamson and David B. Shmoys
Approximation Algorithms for NP-Hard Problems by Dorit S. Hochbaum