Combinatorics and graph theory 3

Lecture: Thursdays 14:00–15:30 in S11. Tutorials: Wednesdays 9:00–10:30 in S1.

Conditions to pass the tutorials: Getting sufficiently many points from homeworks, active participation; for more details, contact Michal Seweryn who leads the tutorials.

Plan of lectures
  • 3.10 (lecture given by Robert Šámal): Graph classes closed under subgraphs/minors/...: Lecture notes: Introduction and Section 1, excluding the parts on treedepth.
  • 10.10.: Minor-closed classes, Hadwiger's conjecture, average degrees: Lecture notes: Everything except for section 4.
  • 17.10.: Topological minors, Hajós' conjecture, linkedness: Lecture notes: Sections 2 and 3; Lemma 2 from these notes.
  • 24.10.: Tree decompositions and treewidth, brambles. Definition and Corollary 9 (with slightly different proof) from these lecture notes, section 1 from these. See these notes for the results on brambles, till the end of Section 1.
  • 31.10. Grid minors, ladder lemma, Courcelle's theorem. Lecture notes, section 2, and these notes, section 1.
  • 7.11.: List coloring and polynomial method: Lecture notes, only the part on Alon-Tarsi method.
  • 14.11., 21.11.: VC-dimension (definition, examples, statement of Theorem 3, application to approximation algoritms from the lecture notes).
  • 28.11.: Spanning trees (everything from the lecture notes).
  • 5.12.: Epsilon-regular pairs and the formulation of the Regularity Lemma. Lecture notes.
  • 12.12.: Applications of the Regularity Lemma. Lecture notes.
  • 19.12.: Arithmetic Ramsey theory. Section 1 from the lecture notes.
  • 9.1.: Proof of Regularity lemma. Lecture notes.
Obsah přednášek a poznámky
  1. Epsilon-regulární páry
  2. Regularity lemma a jeho aplikace
  3. Další aplikace a důkaz Regularity lemmatu
  4. Hypergrafové removal lemma a aritmetická Ramseyovská teorie.
  5. Minory a stupně.
  6. Linkovanost a topologické minory.
  7. Erdős-Hajnalova hypotéza. Kografy.
  8. Stromové rozklady, chordální grafy, stromová šířka, Erdős-Pósova věta.
  9. Algoritmické aspekty stromové šířky.
  10. Kostry v grafech, English version.
  11. Polynomiální metoda, Nullstellensatz (plus úvod do seznamové barevnosti), English version.
  12. VC-dimenze, English version.
Další zdroje

Domácí úkoly (rok 2016):

Domácí úkoly (rok 2015):

Anglické verze poznámek (rok 2014):