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essential degenerate

Last-modified: 2011-06-05 (日) 01:02:23

Definition Edit

  • In a topological space (X,τ), a subset A of X is said to be essential degenerate if it is contained in cl({x})∩ker(x) for some x of X.

Reference Edit

  • Guia, Josep, Axioms weaker than R0., (Serbo-Croatian summary), Mat. Vesnik 36 (1984), no. 3, 195–205.