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## Proof of Conway's lost cosmological theorem

### Shalosh B. Ekhad and Doron Zeilberger

**Abstract.**
John Horton Conway's Cosmological Theorem about sequences like 1, 11,
21, 1211, 111221, 312211,..., for which no extant proof existed, is
given a new proof, this time hopefully for good.

*Copyright 1997 American Mathematical Society*

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#### Article Info

- ERA Amer. Math. Soc.
**03** (1997), pp. 78-82
- Publisher Identifier: S 1079-6762(97)00026-7
- 1991
*Mathematics Subject Classification*. Primary 05Axx
- Received by the editors May 6, 1997
- Posted on August 21, 1997
- Communicated by Ronald Graham
- Comments (When Available)
- Accompanying programs (Maple)

**Shalosh B. Ekhad**

Department of Mathematics, Temple University, Philadelphia, PA 19122

*E-mail address:* `ekhad@math.temple.edu`

**Doron Zeilberger**

Department of Mathematics, Temple University, Philadelphia, PA 19122

*E-mail address:* `zeilberg@math.temple.edu`

Supported in part by the NSF

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