𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A conjecture concerning Ramsey's theorem

✍ Scribed by Martin Erickson


Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
204 KB
Volume
126
Category
Article
ISSN
0012-365X

No coin nor oath required. For personal study only.

✦ Synopsis


P(c, m). If the edges of a countable injinite complete graph G are exactly c-colored, then there exists a countable infinite complete subgraph H of G whose edges are exactly m-colored.

The purpose of this note is to inquire as to which pairs c, m of positive integers make P(c, m) a true statement.

2. Sufficient conditions

If m= 1, then P(c, m) is just Ramsey's theorem with the hypothesis strengthened from c-coloring to exact c-coloring, so P(c,m) is true a fortiori.


πŸ“œ SIMILAR VOLUMES


On a Conjecture Concerning a Theorem of
✍ Guenther Walther πŸ“‚ Article πŸ“… 1997 πŸ› Elsevier Science 🌐 English βš– 302 KB

A conjecture concerning the Crame r Wold device is answered in the negative by giving a Fourier-free, probabilistic proof using only elementary techniques. It is also shown how a geometric idea allows one to interpret the Crame r Wold device as a special case of a more general concept.

A lower bound for Ramsey's theorem
✍ Joram Hirschfeld πŸ“‚ Article πŸ“… 1980 πŸ› Elsevier Science 🌐 English βš– 291 KB

For every integer tz we denote by n the set {O, 1, . . . , n -1). We denote by En]" the collection of subsets of with exactly k elements. We call the elements of [n]" k-tuples and write thein dlown as (a,, . . . , a,) in the natural order: a, < a, c l . l < ak < n. A colouting 04 [nlk by r colours i

A linear Ramsey theorem
✍ David Feldman; James Propp πŸ“‚ Article πŸ“… 1992 πŸ› Elsevier Science 🌐 English βš– 350 KB
A Euclidean Ramsey theorem
✍ M. BΓ³na πŸ“‚ Article πŸ“… 1993 πŸ› Elsevier Science 🌐 English βš– 168 KB

In this note we shall prove a geometric Ramsey theorem. Let T be a triangle with angles 30, 60 and 90 degrees, and with hypotenus of unit length. Then the theorem says that if one threecolors the 3-space, then there is always a copy of T with monochromatic vertices. We shall also show that there is