2011Journal of Chengdu UniversityRequires access

Nearly Weak θ Refinable Spaces

Kang Su-ling

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Abstract

The following results are proved:(1)A space X is nearly weak θ refinable if X is nearly discretely weak θ refinable expandable and for every open cover u={Uα:α∈∧} of then there is a dense set DX and a V=∪n∈ω Vn of open refinements of u such that for each x∈D there are n∈ω and α∈∧ with x∈Uα and st(x,Vn)∪β≤αUβ;(2)Let X=∏α∈∧Xα be|∧|—paracompact,then it is weakrefinable space if ∏α∈FXα is weak θ refinable space for every F∈[∧]ω.

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The following results are proved:(1)A space X is nearly weak θ refinable if X is nearly discretely weak θ refinable expandable and for every open cover u={Uα:α∈∧} of then there is a dense set DX and a V=∪n∈ω Vn of open refinements of u such that for each x∈D there are n∈ω and α∈∧ with x∈Uα and st(x,Vn)∪β≤αUβ;(2)Let X=∏α∈∧Xα be|∧|—paracompact,then it is weakrefinable space if ∏α∈FXα is weak θ refinable space for every F∈[∧]ω.

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Available abstract

The following results are proved:(1)A space X is nearly weak θ refinable if X is nearly discretely weak θ refinable expandable and for every open cover u={Uα:α∈∧} of then there is a dense set DX and a V=∪n∈ω Vn of open refinements of u such that for each x∈D there are n∈ω and α∈∧ with x∈Uα and st(x,Vn)∪β≤αUβ;(2)Let X=∏α∈∧Xα be|∧|—paracompact,then it is weakrefinable space if ∏α∈FXα is weak θ refinable space for every F∈[∧]ω.

Key concepts: Space (punctuation), Cover (algebra), Mathematics, Pure mathematics, Set (abstract data type), Discrete mathematics, Combinatorics, Physics

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