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On sequential properties of Noetherian topological spaces. (English) Zbl 1086.54015

Let \((X,\tau)\) be a Noetherian topological space (every strictly ascending chain of open sets is finite). The authors show that \((X,\tau)\) is sequentially compact and \(s\)-compact (related notions of semicompactness are discussed). Further, they define \(h(x)\), the height of \(X\) (related notions of dimension are discussed) and show that, if every irreducible closed subset of \(X\) has a generic point, then \(X\) is sequential if and only if \(h(X)\leq\omega_1\); this implies that the prime spectrum of a commutative Noetherian ring is a sequential Noetherian topological space.

MSC:

54D55 Sequential spaces
54D20 Noncompact covering properties (paracompact, Lindelöf, etc.)
13E05 Commutative Noetherian rings and modules
54D30 Compactness
54D10 Lower separation axioms (\(T_0\)–\(T_3\), etc.)
54A10 Several topologies on one set (change of topology, comparison of topologies, lattices of topologies)
13J99 Topological rings and modules