Cardinal invariants for κ-box products: weight, density character and Suslin number
W. W. Comfort ; Ivan S. Gotchev
GDML_Books, (2016), p.

The symbol (XI)κ (with κ ≥ ω) denotes the space XI:=iIXi with the κ-box topology; this has as base all sets of the form U=iIUi with Ui open in Xi and with |iI:UiXi|<κ. The symbols w, d and S denote respectively the weight, density character and Suslin number. Generalizing familiar classical results, the authors show inter alia: Theorem 3.1.10(b). If κ ≤ α⁺, |I| = α and each Xi contains the discrete space 0,1 and satisfies w(Xi)α, then w(Xκ)=α<κ. Theorem 4.3.2. If ωκ|I|2α and X=(D(α))I with D(α) discrete, |D(α)| = α, then d((XI)κ)=α<κ. Corollaries 5.2.32(a) and 5.2.33. Let α ≥ 3 and κ ≥ ω be cardinals, and let Xi:iI be a set of spaces such that |I|⁺ ≥ κ. (a) If α⁺ ≥ κ and αS(Xi)α for each i ∈ I, then α<κS((XI)κ)(2α); and (b) if α⁺ ≤ κ and 3S(Xi)α for each i ∈ I, then S((XI)κ)=(2<κ).

EUDML-ID : urn:eudml:doc:285978
@book{bwmeta1.element.bwnjournal-rm-doi-10_4064-dm748-2-2016,
     author = {W. W. Comfort and Ivan S. Gotchev},
     title = {Cardinal invariants for $\kappa$-box products: weight, density character and Suslin number},
     series = {GDML\_Books},
     year = {2016},
     zbl = {06622342},
     language = {en},
     url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-rm-doi-10_4064-dm748-2-2016}
}
W. W. Comfort; Ivan S. Gotchev. Cardinal invariants for κ-box products: weight, density character and Suslin number. GDML_Books (2016),  http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-rm-doi-10_4064-dm748-2-2016/