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Exercise 3.F.20

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Proof. Let $φ \in W^{0}$ . From Exercise 17, it follows that $W \subset null φ$ and, since $U \subset W$ , $U \subset null φ$ . Therefore $φ \in U^{0}$ and thus $W^{0} \subset U^{0}$ . □

celiopassos

2017-10-06 00:00

Exercise 3.F.20

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