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Dec 9, 2023 at 17:23 comment added Pietro Majer Notation: I would distinguish, for $A\subset X$ and $B\subset X^*$, between annihilator $A^\perp\subset X^*$ and pre-annihilator $B_\perp:=B^\perp\cap X\subset X$ (where we regard $X$ as canonically embedded in its bidual $X^{**}$)
S Nov 9, 2023 at 16:53 review First answers
Nov 9, 2023 at 17:08
S Nov 9, 2023 at 16:53 history answered Cauchy's Sequence CC BY-SA 4.0