Show That X X X Where Are Anyl Formulas

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Question Description

Problem

1 (5 pts)

.

Show that

{∀

x

(

α

β

)

} `

(

)

(

)

where

α,β

are any

L

-formulas.

Problem

2 (5pts)

.

Fix a first order language

L

and let

α

be an

L

-sentence. Suppose that for every

N

N

there is an

L

-structure with at least

N

elements that satisfies

α

. Show that there is an infinite

L

-structure

that satisfies

α

. (You will need to use the completeness theorem.)

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