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Apr 20, 2018 at 11:14 comment added Pietro Majer In fact I think it is well-known even in the more general context of self-adjoint closed operators, using Gateaux derivative and the Ekeland's principle in its strength.
Apr 20, 2018 at 6:07 comment added Piotr Hajlasz Nice. Is there any reference for this argument or it is yours?
Apr 19, 2018 at 23:41 history edited Pietro Majer CC BY-SA 3.0
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Apr 19, 2018 at 23:24 history answered Pietro Majer CC BY-SA 3.0