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Monotonicity of inconsistency
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Area of mathematics
Foundations of mathematics
Mathematical logic
First-order logic
First-order theory
Consistent first-order theory
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Every theory containing an inconsistent subtheory is inconsistent, because the same finite derivation of contradiction remains available.
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Consistent first-order theory
First-order theory
First-order logic
Mathematical logic
Foundations of mathematics
Area of mathematics
Mathematics
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