## Archival Version

**These pages are not updated anymore.
They reflect the state of
.
For the current production of this journal, please refer to
http://www.math.psu.edu/era/.
**

Some results on the m(4) problem of Erdos and Hajnal
**This journal is archived by the American Mathematical
Society. The master copy is available at
http://www.ams.org/era/
**

## Some results on the m(4) problem of Erdös and Hajnal

### Gregory M. Manning

**Abstract.**
A recursive computer program has shown that $m(4)\ge20$.

*Copyright American Mathematical Society 1996*

**Retrieve entire article **

#### Article Info

- ERA Amer. Math. Soc.
**01** (1995), pp. 112-113
- Publisher Identifier: S1079-6762(95)03004-1
- 1991
*Mathematics Subject Classification*. Primary 05A05; Secondary 05B30, 05D05 .
- Received by the editors June 10, 1995, and, in revised form, October 9, 1995
- Communicated by Ronald Graham
- Comments (When Available)

**Gregory M. Manning**

Department of Mathematical Sciences, Northern
Illinois University, DeKalb, IL, 60115.

*E-mail address:* `manning@math.niu.edu `

*Electronic
Research Announcements of the AMS *Home page