| 21. | "Unobservables " is a reference similar to Immanuel Kant's distinction between phenomena ( the perceived object ).
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| 22. | Using dynamic programming to solve concrete problems is complicated by informational difficulties, such as choosing the unobservable discount rate.
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| 23. | The theory was quickly replaced by special relativity, which gave similar formulas without the existence of an unobservable aether.
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| 24. | In everyday life, there may be processes in which the increase of entropy is practically unobservable, almost zero.
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| 25. | While an experiment ensures, in confounded by unobservable factors that influenced which units received the treatment versus the control.
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| 26. | During the reign of behaviorism in the mid-20th century, unobservable phenomena such as metacognition were largely ignored.
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| 27. | Measurements c and d are redundant in the second case above, even though part of the system is unobservable.
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| 28. | One simple solution exists : if at least one of the quarks of the standard model is massless, becomes unobservable.
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| 29. | An example is Comet 11P / Tempel Swift LINEAR, discovered in 1869 but unobservable after 1908 because of perturbations by Jupiter.
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| 30. | The third kind is the physically unobservable, that which can never be observed by any existing sense-faculties of man.
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