高国士.关于M1-空间的又一注记[J].数学研究及应用,1985,5(4):47~48
关于M1-空间的又一注记
Another Note on M1-spaces
投稿时间:1984-03-10  
DOI:10.3770/j.issn:1000-341X.1985.04.009
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高国士 苏州大学 
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英文摘要:
      In this note, we prove that, let f be a quasi-open, closed mapping from an M1-space x onto a q-space (or a space of pointwise countable type) Y, then y is an M1-space; which partially answers a classic problem. "Is the irreducible closed image of an M1-space M1?" (irreducible closed mapping→quasi-open mapping).
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