3 de janeiro de 2006

Chaos Theory

Para começar vou por a deficinição da teoria do caos existente no Wikipedia:

In mathematics and physics, chaos theory deals with the behavior of certain nonlinear dynamic systems that under certain conditions exhibit a phenomenon known as chaos, which is characterised by a sensitivity to initial conditions (see butterfly effect). As a result of this sensitivity, the behavior of systems that exhibit chaos appears to be random, even though the model of the system is deterministic in the sense that it is well defined and contains no random parameters. Examples of such systems include the atmosphere, the solar system, plate tectonics, turbulent fluids, economies, and population growth.

Isto é matematicamente e fisicamente falando. Um sistema caotico é algo que mudando os seus parametros de forma infima, leva a um resultado totalmente diferente do esperado. Mas matematicamente falando um sistema caotico não é aleatório:

For starters, a chaotic system is not a random system. A chaotic system sometimes SEEMS random if you do not recognize that it is chaotic. For example, a roulette wheel is a chaotic system (trust me, it's not random, I'll explain why later). If you look at a fairly normal system such as a ball bouncing straight up and down against the ground, and you want to find out how high this ball will be after a certain amount of time, you would want to find out at what height the ball is dropped from, the strength of gravity, etc. and then you could easily plug these numbers into equations and then get the right answer. This is what happens in theory. In practice, since you will have to actually make measurements, what might happen is that your measurement might be a millimeter too high. If you did this, what would happen to the value that you would calculate with the slightly incorrect value? You would get an answer that was extremely close to what the ball actually did. A slight error in measurement is barely even noticeable.

Now lets consider a chaotic system, such as a ball on a roulette wheel. You might say, "hold on now, isn't a roulette table random?!", but it really isn't. Doesn't a bouncing roulette ball obey the same laws of physics as the ball bouncing against the ground? Because its behaviour is governed by laws that dictate exactly where the ball will land, the roulette wheel is not random. Another way to say that this system is not random, is to say that it is deterministic. If you wanted to find out where on the roulette table a ball would land you would need to find how high the ball was dropped from, how fast the table is spinning and the dimensions of the roulette table. Then, in theory you should be able to plug these numbers into equations and get the right answer. Again, in theory, you should be able to predict how the ball bounces straight up and down against the ground as easily as you can predict how a roulette ball will bounce on a roulette wheel. Of course if you actually tried to predict where the roulette ball would land, you'd get the wrong answer (otherwise gambling would much too easy).
Não é aleatorio porque os parametros são bem conhecidos. O resultado é que pode variar infitamente consoantes esses parametros.

Mas não é sobre isto que quero falar. Eu quero falar da minha visão da Teoria do Caos. Uma visão mais social, mais filosofica.

Basicamente eu acredito que tudo é aleatório ou ao acaso. Tou a contradizer-me em relação ao que escrevi anteriormente. Dai o italico.

É aleatório do ponto de vista do individuo, mas do ponto de vista do modelo não. E visto que eu tenho uma visão egoista de tudo (proximos posts) vou falar como se fosse aleatório.

Basicamente tudo acontece por acaso. Damn, o destino é acaso, se é que se pode falar de destino. É aqui que entra o Efeito Borboleta. Porque todas as interacções que faço têm um efeito minimo no caos desse sistema.

E são essas interacções que posso controlar. Não o passado, pois já foi. Não o futuro pois não posso prever o que ai vem. (É aleatório right?)

A unica coisa que posso controlar é o presente. Á lá pub da Vodafone, vive o momento.

E é nesse momento que posso usar algo que todos nós temos e que todos nós podemos usar: O poder de decisão.

É o poder de decisão que nos faz agir. Só agimos porque decidimos agir. E decidimos agir usando o poder de decisão.

2 comentários:

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