RETRACTED: A proof of Nirenberg conjecture on expansive mappings in Hilbert spaces
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DOI: 10.1016/j.jmaa.2020.124526
Abstract: Abstract Let X be a real Hilbert space. Let T : X → X be a continuous and α-expansive operator. Nirenberg proposed a problem as to whether or not T (with α = 1 )… read more here.
Keywords: expansive mappings; mappings hilbert; retracted proof; nirenberg conjecture ... See more keywords