论文信息 - Functions and Mappings - 字舞流文

Functions and Mappings

A function f: X→ Y is open (closed) if and only if the image of each open (closed) set in X is open (closed) in Y.

Gordon Whyburn | Edwin Duda | G. Whyburn | E. Duda

[1] G. Whyburn. On quasi-compact mappings , 1952 .

[2] G. Whyburn. Open and closed mappings , 1950 .