The relative strength of two systems of formal logic can be defined via model theory. Specifically, a logic is said to be as strong as a logic
if every elementary class in
is an elementary class in
.[1]
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Theorems (list) and paradoxes | |||||||||
Logics |
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Set theory |
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Formal systems (list), language and syntax |
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Proof theory | |||||||||
Model theory | |||||||||
Computability theory | |||||||||
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