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Ignorance space : ウィキペディア英語版
Ignorance space


The ignorance space is the first component of the Bernoulli space which constitutes the stochastic model within Bernoulli stochastics.〔Elart von Collani (ed.), ''Defining the Science Stochastics'', Heldermann Verlag, Lemgo, 2004.〕 Ignorance means lack of knowledge about facts. Since Bernoulli Stochastics is a mathematical science, the facts refer to characteristics that are quantified by variables, and each fact is therefore represented by a unique real number. Because the considered variable has a fixed, i.e., determinate value, the variable is called deterministic variable denoted ''D''. For example, consider a given object and let the characteristic of interest be the mass of the object. Then the deterministic variable ''D'' stands for mass which is quantified by the unit ''kilogram'' and for the object at hand ''D'' is fixed by a real number.
==Ignorance, knowledge and truth==

In the above example the mass of the object is fixed and the corresponding real number, say d_0 specifies the value of ''D'' ''kilogram''. The real number d_0 constitutes the truth about the mass of the object. However, human beings are not able to determine the truth given by d_0, since whatever measurement device is used, the measurement process is subject to randomness and the determination of the true value d_0 of the deterministic variable ''D'' is in principle impossible.
It follows that human beings in general cannot know "what is", for example, the true value d_0. But, they can, of course know "what is not" since any weighing device yields a more or less small set \mathfrak_0 which contains the true but unknown value d_0. Thus human knowledge generally refers to "what is not" namely all numbers which are not contained in \mathfrak_0, but it remains unknown which of the elements of \mathfrak_0 is the true one.
Thus, human ignorance refers to truth, i.e., "what is", while human knowledge refers "what is not". The set \mathfrak_0 describes therefore the state of ignorance about the true value d_0 of the deterministic variable ''D''. Therefore the set \mathfrak_0 is called ignorance space of ''D'' denoted \mathfrak.〔Elart von Collani, Defining and medelling uncertainty, ''Journal of Uncertain Systems'', Vol. 2, 202–211, 2008, ().〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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