Equalities for the extent of infinite products and Σ-products
نویسندگان
چکیده
For a space X, let e(X)=ω⋅sup{|D|:D is closed discrete subset in X}, which called the extent of X. Here we deal with following two questions: product X=∏λ∈ΛXλ, when e(X)=|Λ|⋅sup{e(Xλ):λ∈Λ}? Σ-product Σ spaces Xλ,λ∈Λ, e(Σ)=sup{e(Xλ):λ∈Λ}?
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ژورنال
عنوان ژورنال: Topology and its Applications
سال: 2022
ISSN: ['1879-3207', '0166-8641']
DOI: https://doi.org/10.1016/j.topol.2021.107946