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Let a class
of spaces be given. A member U of
is
said to be universal for
if every member of
can be embedded in U, i.e., if for every
there
exists a homeomorphism
. Accordingly, a dendrite is
said to be universal if it contains a homeomorphic image of any
other dendrite.
Janusz J. Charatonik and Pavel Pyrih
2000-09-21