Homeomorphisms are precisely the isomorphisms in the category \(\mathbf{Top}\) of topological spaces and continuous maps.
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That outcome isn’t accidental. The Trust’s website invites anyone wishing to reproduce Mondrian’s work to “contact us about images you wish to reproduce… so that we can check on the copyright status and clear rights if needed.” The implication is clear: ask permission first, and the answer may depend less on the law than on who’s asking.