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arXiv · 0806.4785

"Iff" is not expressible in independence-friendly logic

Allen L. Mann
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Abstract

Ordinary first-order logic has the property that two formulas ϕand ψhave the same meaning in a structure if and only if the formula ``ϕiff ψ'' is true in the structure. We prove that independence-friendly logic does not have this property.

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Allen L. Mann. 2008-06-29. "Iff" is not expressible in independence-friendly logic. https://arxiv.org/abs/0806.4785

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