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ianuarie 29, 2008

UFO si teoria algoritmica a informatiei

Filed under: teoria algoritmica a informatiei — cercul @ 3:01 pm
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Citind  de curand articolul lui Gregory J. Chatin  Information-Theoretic Computational Complexity unul din pargarafe m-a dus cu gandul la comunitatea UFO si efortul acestei comunitati de a construi sau impune o teorie care as fie acceptata de comunitatea stiintifica. Pargaraful respectiv suna astfel:
Solomonoff [7] and the author [9] proposed that the concept of complexity might make it possible to precisely formulate the situation that a scientist faces when he has made observations and wishes to understand them and make predictions. In order to do this the scientist searches for a theory that is in agreement with all his observations. We consider his observations to be represented by a binary string, and a theory to be a program that calculates this string. Scientists consider the simplest theory to be the best one, and that if a theory is too “ad hoc,” it is useless. How can we formulate these intuitions about the scientific method in a precise fashion? The simplicity of a theory is inversely proportional to the length of the program that constitutes it. That is to say, the best program for understanding or predicting observations is the shortest one that reproduces what the scientist has observed up to that moment. Also, if the program has the same number of bits as the observations, then it is useless, because it is too “ad hoc.” If a string of observations only has theories that are programs with the same length as the string of observations, then the observations are random, and can neither be comprehended nor predicted. They are what they are, and that is all; the scientist cannot have a theory in the proper sense of the concept; he can only show someone else what he observed and say “it was this.” 
Din acest punct de vedere, actualele teorii UFO sunt in cateogoria ad hoc. Daca la punctul de vedere al lui Solomonoff si Chatin se adauga si caracteristicile teoriei stiintifice in viziunea lui Karl Popper nu se poate vorbi de o teorie stiintifica in cazul UFO. Chiar si relaxand conditiile lui Karl Popper totusi teoriile UFO nu poate fi testabila, la acest fapt adaugandu-se faptul ca nu se poate vorbi de o metoda stiintifica in studierea fenomenului OZN.

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