ls-Ponomarev-systems and 1-sequence-covering mappings
نویسندگان
چکیده
In this paper, we prove that f is an 1-sequence-covering (resp., 2sequence-covering) mapping from a locally separable metric space M onto a space X if and only if {(Xλ, {Pλ,n}) : λ ∈ Λ} is a double point-star wsn-cover (resp., double point-star so-cover) for X, where (f,M,X, {Pλ,n}) is an ls-Ponomarevsystem, and investigate further properties of mappings in the ls-Ponomarevsystem (f,M,X, {Pλ,n}).
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