| 21. | The ergodic hypothesis is not a necessary condition for statistical mechanics to work.
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| 22. | In some cases, the necessary conditions are also sufficient for optimality.
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| 23. | I think that this is a necessary condition for defeating terrorism.
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| 24. | Intensionally defined classes usually have necessary conditions associated with membership in each class.
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| 25. | It is a necessary condition for economic growth and social justice.
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| 26. | This necessary condition for optimality conveys a fairly simple economic principle.
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| 27. | This demonstrates that sex is not a necessary condition for speciation.
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| 28. | Communication is a necessary condition for an idea to take hold.
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| 29. | He said financial and structural reforms were necessary conditions for expanding the EU.
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| 30. | This will create the necessary conditions for investment in the country.
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