題組內容
(1)[5+10+10分]A function d:M x M → 10,[0，∞) is called an uitrametric if
● d(x, y) = 0 if and only if x = y;
●d(x,y) =d(y,x);
●d(x,z) ≤ max(d(x,y),d(y, z)}
for any t,y,z
M. We call (M,d) an ultrametric space.
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(1)[5+10+10分]A function d:M x M → 10,[0，∞) is called an uitrametric if
● d(x, y) = 0 if and only if x = y;
●d(x,y) =d(y,x);
●d(x,z) ≤ max(d(x,y),d(y, z)}
for any t,y,z M. We call (M,d) an ultrametric space.