MHB Existential Theory: Understanding Last Proposition

Thread starter mathmari
Start date Jul 16, 2015
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Theory

Jul 16, 2015

mathmari

Gold Member

MHB

Hey!

I am reading the following lemma about (positive) existential theory:

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Could you explain to me the last proposition?

Why does this hold?

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Jul 18, 2015

mathmari

Gold Member

MHB

I found that in a survey... The whole that is related to that is the following:

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