Isometries for the Legendre-Fenchel transform
Isometries for the Legendre-Fenchel transform
It is shown that on the space of lower semicontinuous convex functions defined on <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper R Superscript n"> <mml:semantics> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mi>R</mml:mi> <mml:mi>n</mml:mi> </mml:msup> </mml:mrow> <mml:annotation encoding="application/x-tex">{R^n}</mml:annotation> </mml:semantics> </mml:math> </inline-formula>, the conjugation map—the Legendre-Fenchel transform—is an isometry with respect to some metrics consistent with the …