deterministic system (philosophy)

A deterministic system is a conceptual model of the philosophical doctrine determinism applied to a system for understanding everything that has and will occur in the system, based on the physical outcomes of causality. In a deterministic system, every action, or cause, produces a reaction, or effect, and every reaction, in turn, becomes the cause of subsequent reactions. The totality of these cascading events can theoretically show exactly how the system will exist at any moment in time.

An example system

To understand this concept, start with a fairly small everyday system. Visualize a set of three dominos lined up in a row with each domino less than a domino's length away from its neighbors, impervious to external environment influences. Once the first domino has toppled, the third domino will topple because the second will topple upon being contacted by the first domino, then the second will strike the third, causing it to topple. This could feasibly be shown by a scientist using a computer model frontloaded with the ability to correctly apply physics. Small deterministic systems are easy to visualize, but are necessarily linked to the rest of reality by an initial cause and/or final effect. To go back to the dominos, something outside the system has to cause the first domino to topple. The last domino falling might cause something else outside the system to happen. And the system itself must be considered in isolation--if external forces such as hurricanes, earthquakes or the hands of nearby people were taken into consideration, the final domino toppling might not be a pre-determined outcome. Complete isolation of a system is unrealistic, but useful for understanding what would normally happen to a system when the possiblity of external influences is negligible. Complex physical systems are necessarily built using simpler ones, and you have to start somewhere. The domino example is developed in the Petri net computational model. This example assumes that dominos toppling into each other behave deterministically. Even the above-mentioned external forces which might interrupt the system are causes which the system did not consider, but which could be explained by cause and effect in a larger deterministic system (which included hurricanes, etc).

Some deterministic systems

Classical physics is the deterministic system assumed in the domino example which scientists can use to describe all events which take place on a scale larger than individual atoms. Classical physics includes Newton's laws of motion, Classical electrodynamics, thermodynamics, the Special theory of relativity, the General theory of relativity, chaos theory and nonlinear dynamics. Some of these systems are complex, and events may be difficult to predict in practice, but if the starting conditions were known in enough detail, the outcomes of events in such systems could be predicted.

Nearly all electronic computers in use today are based on theoretical von Neumann computers or Turing machines, i.e.: they are devices that perform one small, deterministic step at a time. If all inputs are specified, the computer will always produce a particular output which is calculated deterministically. Computer scientists also study other models of computation including parallel computers (more than one deterministic step at a time) and quantum computers.

Some non-deterministic systems

Events without natural causes could not be part of a deterministic system. Whether such events actually occur is a matter of philosophical and scientific debate, but possible uncaused events include:

Completely random events

Quantum physics holds that certain events such as radioactive decay and movement of particles are completely random when taken at the level of single atoms or smaller. Schrdinger's cat is a famous thought experiment in which a cat's survival cannot be determined theoretically before the experiment is done. For almost all everyday non-microscopic occurrences, however, the probability of such random events is extremely close to zero, and can be approximated to almost certainty with statistics using the correspondence principle. The philosophical consequences of quantum physics were once considered by many (including Albert Einstein) to be a major problem for the scientific method which traditionally used a strong version of scientific determinism (see Philosophy of science).

Mysterious miracles

A miracle such as the resurrection of Jesus (as believed by Christians) is considered a miracle by those who believe it happened mostly because the effect is mysterious and has no natural cause--supernatural causes cannot be part of a deterministic system.

Systems with controversial classification

Some systems are particularly difficult to classify as deterministic or not, and have generated much philosophical debate. The major example would be human minds, and possibly animal minds too. Can people have free will if their minds are truly deterministic? Conversely, when deterministic computers are said to exhibit artificial intelligence, how are their minds similar to ours?

The entire universe

The larger the deterministic system, the longer the necessary chain of cause and effect. The entire universe may be considered as such a system, which creates its own philosophical questions (see Determinism).