| 21. | David Krantz wrote the formal proof to prospect theory using the theory of conjoint measurement.
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| 22. | These are not true definitions and could not be used in formal proofs of statements.
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| 23. | Two bells attested, there is no formal proof as to the existence of the third.
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| 24. | :It may not be elegant but you can reach a formal proof by considering cases.
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| 25. | Purely formal proofs, written in symbolic language instead of natural language, are considered in proof theory.
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| 26. | It is informal but quite correct, as a more formal proof ( Holster 2003 ) confirms.
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| 27. | In recent years, he has taken an interest in formal methods, formal proofs and certified compilation.
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| 28. | The seL4 microkernel has a formal proof that it can be configured as a separation kernel.
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| 29. | Formal proofs are expressed in some formal language.
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| 30. | They are then believed to be hard to break, but no such formal proof is given.
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