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Homomorphisms and signature packing in signed graphs.

A course for graduate student NWPU-China, invited by Yandong Bay. December 2022--February 2023.

Aim of the course: After introducing and motivating the study of homomorphisms of signed graphs, we will establish connection between the problem of packing signatures in a given signed graphs and special case of homomorphism problems. Then we will present proof of an strengthening of the four-color theorem using the mix of the two notions.

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  • Signed graphs coloring, a course originally aimed for graduate students at ZJNU, and welcomed about 30 participants from following countries: Canada, China, Chile, Egypt, France, India, Lebanon, Senegal, Slovenia, USA,. Classes were held on Zoom, Saturdays 9AM, starting from Jan-May 2021. After each lecture there were presentations by students. Lectures started January 09 and continued until April 03 (2021).
  • Note: Due to success of the class, we plan to continue the class in spring semester(2021).
    Participations both in attending or offering a lecture are welcomed. For the latter please write to me or Xuding.




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