Definition of a Downward Closed Feasible Set Single Parameter Environment (Game Theory)












0














Could someone give more clarification on what a downward closed feasible set?



So we have a Single Parameter Environment with feasible set X.
The definition given is: subsets of a feasible set are again feasible.



My first opinion of the definition seems to be that:



$X' subset X$ is a feasible set $forall X' subset X$.



However, this seems like a trivial observation.



Does downwardly closed mean that for any subset $X'$ of $X$, all $x' in X'$ are of form:



$$x' = {x_1, ldots, x_{i-1}, x_{i+1}, ldots, x_n}$$ and $${x_1, ldots, x_{i-1}, x_i, x_{i+1}, ldots, x_n} in X$$,



$X'$ is a feasible set.










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    0














    Could someone give more clarification on what a downward closed feasible set?



    So we have a Single Parameter Environment with feasible set X.
    The definition given is: subsets of a feasible set are again feasible.



    My first opinion of the definition seems to be that:



    $X' subset X$ is a feasible set $forall X' subset X$.



    However, this seems like a trivial observation.



    Does downwardly closed mean that for any subset $X'$ of $X$, all $x' in X'$ are of form:



    $$x' = {x_1, ldots, x_{i-1}, x_{i+1}, ldots, x_n}$$ and $${x_1, ldots, x_{i-1}, x_i, x_{i+1}, ldots, x_n} in X$$,



    $X'$ is a feasible set.










    share|cite|improve this question

























      0












      0








      0







      Could someone give more clarification on what a downward closed feasible set?



      So we have a Single Parameter Environment with feasible set X.
      The definition given is: subsets of a feasible set are again feasible.



      My first opinion of the definition seems to be that:



      $X' subset X$ is a feasible set $forall X' subset X$.



      However, this seems like a trivial observation.



      Does downwardly closed mean that for any subset $X'$ of $X$, all $x' in X'$ are of form:



      $$x' = {x_1, ldots, x_{i-1}, x_{i+1}, ldots, x_n}$$ and $${x_1, ldots, x_{i-1}, x_i, x_{i+1}, ldots, x_n} in X$$,



      $X'$ is a feasible set.










      share|cite|improve this question













      Could someone give more clarification on what a downward closed feasible set?



      So we have a Single Parameter Environment with feasible set X.
      The definition given is: subsets of a feasible set are again feasible.



      My first opinion of the definition seems to be that:



      $X' subset X$ is a feasible set $forall X' subset X$.



      However, this seems like a trivial observation.



      Does downwardly closed mean that for any subset $X'$ of $X$, all $x' in X'$ are of form:



      $$x' = {x_1, ldots, x_{i-1}, x_{i+1}, ldots, x_n}$$ and $${x_1, ldots, x_{i-1}, x_i, x_{i+1}, ldots, x_n} in X$$,



      $X'$ is a feasible set.







      optimization game-theory combinatorial-game-theory






      share|cite|improve this question













      share|cite|improve this question











      share|cite|improve this question




      share|cite|improve this question










      asked Dec 1 at 2:13









      Bojack Horseman

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