+1 vote
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Which of the following statements is not necessarily true ?

1. $\forall x \: \forall y P(x,y) \Leftrightarrow \forall y \: \forall x P(x,y)$
2. $\exists x \: \exists y P(x,y) \Leftrightarrow \exists y \: \exists x P(x,y)$
3. $\forall x \: \exists y P(x,y) \Rightarrow \exists y \: \forall x P(x,y)$
4. $\exists y \:\forall x P(x,y) \Rightarrow \forall x \: \exists y P(x,y)$
edited | 79 views
+1
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Yes, the correct option is C...
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option c
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can you provide an explaination ?

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