Last Updated：2025/11/29
Although the structures are not isomorphic, they still have elementary equivalence because every first-order sentence true in one is true in the other.
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Although the structures are not isomorphic, they still have elementary equivalence because every first-order sentence true in one is true in the other.
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これらの構造は同型ではないが、ある構造で真となるすべての一階述語の式が他方でも真となるという関係、すなわち初等同値性を持っている。
