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Weakly infinite dimensional subsets of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msup><mml:mi mathvariant="double-struck">R</mml:mi><mml:mi mathvariant="double-struck">N</mml:mi></mml:msup></mml:math>