On 06 Mar 2011, at 14:18, Andrew Soltau wrote:

On 07/02/11 15:22, Bruno Marchal wrote:
This is what seems straightforward to me.

Thought is a computation. OK.

Experiential reality is a computation. OK.

No. When you say "experiential reality" is a computation, you are saying something ambiguous, where comp is far more precise. Because if I can survive with a digital brain, then the experiential reality, the first person, subjective, experience is not a attachable to a computation, but to an infinity of computations, and it obeys a logic driven by the knowing arithmetical points of view, which makes it closer to the non computable notion of "inner god" than to a 3-person computation. The first person cannot even describe (or name, in the logician terms) itself.
Yes! As Everett demonstrates, experiential reality is essentially a very simple computation.


Everett reduces it to the memory mechanism (a bit like in the first step of the UD Argument). But this is not a computation, nor does it explain what is experential. And it relies on a non computable notion of "all consistent observation", which is not computable by the observer itself.

It is the addition of each new observation to the record of observations.

That is not computable. It might be computable with oracle.

The not so simple bit is the computation of each new observation, though in the Everything concept it is relatively simple, since it is simply all possible observations.

We have discussed a lot about the difficulty of the word "all", and "possible".

I think I quoted this before, but this is the computation.

void transtemporal_reality () {
/* Initialisation */
Boolean new_observation = true;
Observation observation = LIGHT;
Functional_Identity observer = 1;
World world_hologram = NO_OBSERVATIONS;
Correlations_Record observables[];
Quantum_State ψ;
Elapsed_Time t = 0;
int c = 0;

while (observer != 0) {
/* Process 1 - Quantum time - Change of quantum mechanical frame of reference */
if ( new_observation ) {
world_hologram = world_hologram + observation;
display (world_hologram);
observer = observer + observation;
observables[c++] = observation;
ψ = quantum_state_defined_by (observables)
new_observation = false;
/* Process 2 - Space-time time - Change of inertial frame of reference */
else {
new_observation = compute_neural_state (ψ, t);
if ( new_observation)
observation = get_sensorium_contents();

If variables ψ, observation, and observables[], and function get_sensorium_contents() were instantiated in suitably coherent memory of a quantum computer, such a program would produce the subjective realities of all possible functional identities of an observer, in the form of Everett's branching tree of memory configurations.

It should be noted that objectively, in a no-collapse universe, ψ is properly a pointer, or reference, to a pre-existing quantum state, and that the implementation of the statement

new_observation = compute_neural_state (ψ, t);

is simply reading a specific attribute of that quantum state, as from a lookup table. This works very nicely given that each observable is a correlation with a specific quantum state of the environment, the correlations record being the simultaneity of all such correlations: a set of commuting operators.

Simple or not, this does not seem ambiguous.

OK, very cute, but you assume ψ as oracle, and even a sort of space- time, which is the treachery I told you about. But to understand why it is "treachery", and why it put the (mind) body problem under the rug, you need to study the step seven, and for this you need to understand completely the first person indeterminacy.



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