### Combinatorial Hierarchy: two decades later

Combinatorial Hierarchy (CH) proposed by Noyes and Bastin is a hierarchy consisting of Mersenne integers M(n)= M

_{M(n-1)}=2

^{M(n-1)}-1 and starting from M

_{1}=2. The first members of the hierarchy are given by 2,3,7,127,M

_{127}=2

^{127}-1 and are primes. The conjecture of Catalan is that the hierarchy continues to some finite prime. It was proposed by Peter Noyes and Ted Bastin that the first levels of hierarchy up to M

_{127}are important physically and correspond to various interactions (see this). I have proposed the levels of CH define a hierarchy of codes containing genetic code corresponding to M

_{7}and also memetic code assignable to M

_{127}(see this).

Pierre Noyes and Ted Bastin proposed also an argument why CH contains only the levels mentioned above. This has not been part of TGD view about CH: instead of this argument I have considered the possibility that CH does not extend beyond M_{127}. With the inspiration coming from email discussion I tried to understand the argument stating that CH contains M_{127} as the highest level and ended up with a possible interpretation of the condition. Zero energy ontology (ZEO) and the representation of quantum Boolean statements A→ B as fermionic parts of positive and negative energy parts of zero energy states is essential. This led to several interesting new results.

- To my best understanding the original argument of Noyes and Bastin does not allow M
_{127}level whereas prime property allows. States at M_{127}level cannot be mapped to zero energy states at M_{7}level. Allowing a wild association with Gödel's theorem, one could say that that there is hube number of truths at M_{127}level not realizable as theorems at M_{7}level.

A possible interpretation is that M

_{127}level corresponds to next level in the abstraction hierarchy defined by CH and to the transition from imbedding space level to the level of "world of classical worlds (WCW) in TGD. The possible non-existence of higher levels (perhaps implied if M_{M127}is not prime) could be perhaps interpreted by saying that there is no "world of WCWs"!

- Rather remarkably, for M
_{7}, which corresponds to genetic code (see this), the inequality serving as consistency condition is saturated. One can say that any set of 64 mutually consistent statements at M_{7}level can be represented in terms of 64 Boolean maps at M_{3}level representable in terms of zero energy states. One obtains an explicit identification for the Boolean algebras involved in terms of spin and isospin states of fermions in TGD framework at level M_{7}so that genetic code seems to be realized at the fundamental elementary particle level thanks to the dimension D=8 of imbedding space. Even more, the level M_{127}corresponding to memetic code emerges in the second quantization of fermions at M_{7}level. Here color triplet property of quarks and color singletness of leptons and the identification of elementary particles as pairs of wormhole contacts are in essential role.

For details see the chapter Genes and Memes of "Genes and Memes" or the article Combinatorial Hierarchy: two decades later.

For a summary of earlier postings see Latest progress in TGD.

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