[最も人気のある!] Et Y wAX^C ~fBA 283017
/ 0 % / % ) , 1 2 !Let x = f−1(y), then ∀Vy,∃Ux ∈ "⇐" If there exist an open set V containing x that E T V = ∅, then X\V is a closed set containing E By the definition of closer E¯, that is the intersection of all closed sets containing E, the set X\V must contain E Thus, x /∈ E¯# ' ( ) % * ) , / 0 1 ) 2 # 3 4 & Uni Siegen De Et "Y wAX^C ~fBA