DBpedia – Linked Data Fragments

Matches in DBpedia 2015-10 for { ?s ?p "In quantum mechanics, Counterfactual definiteness (CFD) is the ability to speak meaningfully of the definiteness of the results of measurements that have not been performed (i.e. the ability to assume the existence of objects, and properties of objects, even when they have not been measured). Counterfactual definiteness is a term used in discussions of physics calculations, especially those related to the phenomenon called quantum entanglement and those related to the Bell inequalities. The single adjective "counterfactual" may also appear in physics discussions where it is frequently treated as a noun. The word "counterfactual" does not mean "characterized by being opposed to fact." Instead, it is used to characterize values that could have been measured but, for one reason or another, were not.Counterfactual measurement values are values derived by means other than direct observation or measure, such as by calculation on the basis of well-substantiated theory. If one knows an equation that permits deriving reliably expected values from a list of inputs to the physical system under investigation, then one has "counterfactual definiteness" in the knowledge of that system. Much of what humans regularly do in the field of engineering to design complex machines such as submarines or the Hubble Telescope depend on the use of physics theories to calculate desired specifications for structures, lenses, etc. The values used to grind a lens or fortify a bulkhead are not the ad hoc results of empirical measurements made to substantiate the theories of optics or the conclusions of materials scientists, but that does not make them in any sense unreliable. They are as reliable as all of the research done to create them, and all the instances of use in the real world in which they have not been disproven."@en }

• Counterfactual_definiteness abstract "In quantum mechanics, Counterfactual definiteness (CFD) is the ability to speak meaningfully of the definiteness of the results of measurements that have not been performed (i.e. the ability to assume the existence of objects, and properties of objects, even when they have not been measured). Counterfactual definiteness is a term used in discussions of physics calculations, especially those related to the phenomenon called quantum entanglement and those related to the Bell inequalities. The single adjective "counterfactual" may also appear in physics discussions where it is frequently treated as a noun. The word "counterfactual" does not mean "characterized by being opposed to fact." Instead, it is used to characterize values that could have been measured but, for one reason or another, were not.Counterfactual measurement values are values derived by means other than direct observation or measure, such as by calculation on the basis of well-substantiated theory. If one knows an equation that permits deriving reliably expected values from a list of inputs to the physical system under investigation, then one has "counterfactual definiteness" in the knowledge of that system. Much of what humans regularly do in the field of engineering to design complex machines such as submarines or the Hubble Telescope depend on the use of physics theories to calculate desired specifications for structures, lenses, etc. The values used to grind a lens or fortify a bulkhead are not the ad hoc results of empirical measurements made to substantiate the theories of optics or the conclusions of materials scientists, but that does not make them in any sense unreliable. They are as reliable as all of the research done to create them, and all the instances of use in the real world in which they have not been disproven.".