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==Proof==
Replacing ''D'' by an ε-neighbourhood of ''f''(''D''), it can be assumed that ''D'' is itself bounded in norm.
For ''z'' in ''D'' and ''v'' in ''X'', set
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Line 9:
==Proof==
Replacing ''D'' by an ε-neighbourhood of ''f''(''D''), it can be assumed that ''D'' is itself bounded in norm.
For ''z'' in ''D'' and ''v'' in ''X'', set
|