The anti-Ramsey threshold of complete graphs

نویسندگان

چکیده

For graphs G and H, let G?rbH denote the property that, for every proper edge-colouring of G, there is a rainbow H in G. graph threshold function pHrb=pHrb(n) this random G(n,p) satisfies pHrb=O(n?1/m(2)(H)), where m(2)(H) denotes so-called maximum 2-density H. Completing result Nenadov, Person, Škori?, Steger [J. Combin. Theory Ser. B 124 (2017), 1–38], we prove matching lower bound pKkrb k?5. Furthermore, show that pK4rb=n?7/15?n?1/m(2)(K4).

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Anti-Ramsey numbers in complete split graphs

A subgraph of an edge-coloured graph is rainbow if all of its edges have different colours. For graphs G and H the anti-Ramsey number ar(G,H) is the maximum number of colours in an edge-colouring of G with no rainbow copy of H. The notion was introduced by Erdős, Simonovits and V. Sós and studied in case G = Kn. Afterwards exact values or bounds for anti-Ramsey numbers ar(Kn, H) were establishe...

متن کامل

Multicoloured Hamilton cycles in random graphs; an anti-Ramsey threshold

Let the edges of a graph G be coloured so that no colour is used more than k times. We refer to this as a k-bounded colouring. We say that a subset of the edges of G is multicoloured if each edge is of a different colour. We say that the colouring is H-good, if a multicoloured Hamilton cycle exists i.e., one with a multicoloured edge-set. Let ARk = {G : every k-bounded colouring of G is H-good}...

متن کامل

On the Ramsey multiplicity of complete graphs

We show that, for n large, there must exist at least nt C(1+o(1))t 2 monochromatic Kts in any two-colouring of the edges of Kn, where C ≈ 2.18 is an explicitly defined constant. The old lower bound, due to Erdős [E62], and based upon the standard bounds for Ramsey’s theorem, is nt 4(1+o(1))t 2 .

متن کامل

Ramsey Numbers of Some Bipartite Graphs Versus Complete Graphs

The Ramsey number r(H, Kn) is the smallest positive integer N such that every graph of order N contains either a copy of H or an independent set of size n. The Turán number ex(m, H) is the maximum number of edges in a graph of order m not containing a copy of H . We prove the following two results: (1) Let H be a graph obtained from a tree F of order t by adding a new vertex w and joining w to ...

متن کامل

Ramsey for Complete Graphs with Dropped Cliques

Let K[k,t] be the complete graph on k vertices from which a set of edges, induced by a clique of order t, has been dropped. In this note we give two explicit upper bounds for R(K[k1,t1], . . . ,K[kr,tr]) (the smallest integer n such that for any r-edge coloring of Kn there always occurs a monochromatic K[ki,ti] for some i). Our first upper bound contains a classical one in the case when k1 = · ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Discrete Mathematics

سال: 2023

ISSN: ['1872-681X', '0012-365X']

DOI: https://doi.org/10.1016/j.disc.2023.113343