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- W993379114 abstract "A mapping f: X→Y is called weak sequence-covering if whenever {ya} is a sequence in Y converging to y ∈ Y, there exist a subsequence {ynk} and xk∈f^-1(ynk)(k∈N) ,x∈f^-1 (y) such that xk→x. The main results are: (1) Y is a sequential, Frechet, strongly Frechet space iff every weak sepuence-covering mapping onto Y is quotient, pseudo-open, countably bi-quotient respectively, (2) weak sequence-covering mapping preserves cs-network and certain k-(cs-)networks, thus some new mapping theorems on k-(cs-)notworks are proved." @default.
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- W993379114 date "1993-01-01" @default.
- W993379114 modified "2023-09-28" @default.
- W993379114 title "WEAK SEQUENCE-COVERING MAPPING AND CS-NETWORK" @default.
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