EDB β€” 26S

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Esercizi

  1. [26S]Sia \(X\) un ordinale e

    \[ P_ x =\{ z\in X, z\in x\} \]

    mostrate che

    \[ βˆ€ x,y∈ X~ ,~ P_ x = P_ y β‡’ x=y\quad . \]

    Soluzione 1

    [26T]

    (Notate la somiglianza con [271]).

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