Jean van Heijenoort
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Leopold Löwenheim
Skolem's paradox
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Decidability (logic)
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Thoralf Skolem
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Ernst Schröder (mathematician)
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Metalogic
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List of logicians
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Löwenheim–Skolem theorem
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Axiomatic system
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Krefeld
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Foundations of mathematics
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History of logic
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Model theory
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Mathematical logic
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May 5
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June 26
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Automated theorem proving
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Leopold Lowenheim
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Leopold Loewenheim
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