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- Larry Eggan, Michael Plantholt
- J. Comb. Theory, Ser. B
- 1986

If A is a ring, we denote by S = S(j4) the set of all primitive ideals of A. A topology may be defined on S in the following way: For 3Q§>, the closure of 3 in S is the set of all P& such that P3fl3. With this topology, S is the structure space [4] of A. It is well known that if A has a unit element, then S is compact [4; 5, p. 208]. Moreover, M. Schreiber… (More)

- Larry Eggan, Frank Harary
- 2004

Gyarfas has recently constructed an elegant new example of a trianglefree infinite graph G with infinite chromatic number. We analyze its structure by studying the properties of a nested family of subgraphs G whose union is G.

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