## Graph Theory

Basic notion that we use form graph theory are compiled in this document. Or a more detailed presentation is given in the Graph Theory [] book of Reihardt Diestel. ↑## Graph Pyramid

A short introduction of the pyramid and graph pyramid concepts are compiled in this document. ↑## Solving Approximatily TSP by Pyramid Models

The main idea of using pyramid models in solving the TSP is that they allow the solving (approximately) of global optimization tasks without performing a global search. Some pyramid models are listet below.### Graph Pyramid Solution of Travelling Salesman Problem

This model uses the well established irregluar graph pyramid concept to solve approximatily the TSP. For more details see >>### A Foveating Pyramid Model of Travelling Salesman Problem

This model has an adaptive spatial structure, and it simulates visual acuity and visual attention. Specifically, the model solves the E-TSP problem sequentially by moving attention from city to city, the same way human subjects do. For more details see >>↑