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Jun 14, 2012 at 2:20 comment added economic Thank you for your answer. But, I cann't still understand the meaning of this sentence of $\|\nabla f\|$ is not bounded away from zero". – unknown (yahoo) 0 secs ago
May 14, 2012 at 7:34 answer added Thomas Rot timeline score: 2
May 14, 2012 at 5:07 comment added Pietro Majer To get acquainted with this notion, you may start from the following exercise: prove that a $C^1$ functional on a Banach space, bounded below and satisfying the Palais-Smale condition (C), is coercive (i.e., sublevel sets are bounded).
May 14, 2012 at 1:46 history asked economic CC BY-SA 3.0