• Emlightened

    System Tau Notes

    November 3, 2017 by Emlightened

    I'm really really sorry, but this is incomplete. I have been making a text document (up to 42kb rn) trying to formalise and explain a Googological System, but it was never finished. I've not edited it in two months, and thought it was a better idea to let it die here than on my hard drive.

    Still, I'm pretty sure there are some interesting and salvageable ideas here. Since writing it, I've learned a lot of type theory (in particular, I think I have a decent understanding of inductive-recursive types), so if I come back here at some point, I should be able to clean up the presentation and present what I have in an inductive, not recursive, manner. (I'd probably also switch from math notation to computing notation, too. Easier to work with in …

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  • Emlightened

    Terms are identified up to equivalence ≡. A model is consistent iff KSK is false.

    • Sabc ≡ ac(bc)
    • Kab ≡ a
    • If ac ≡ bc, c is a free variable and c does not occur in a or b, a ≡ b

    The extensions additionally include some of the following terms. It is not guaranteed that all extensions or combinations of extensions are consistent.

    • Qab ≡ K if a≡b and Qab ≡ SK otherwise
    • Eab ≡ K if there is some c such that ac ≡ b, and Eab ≡ SK otherwise
    • Cab ≡ Kc for some c such that ac ≡ b (if it exists), and Cab ≡ SKK otherwise
    • Mabc ≡ K if there is some d such that bd ≡ c and ad ≡ K, and Mabc ≡ SK otherwise
    • Nabc ≡ Kd for some d such that bd ≡ c and ad ≡ K, and Nabc ≡ SKK otherwise

    First off, K and SK represent the truth values true and false, respectively. Given this, it is somewhat clear what each of…

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  • Emlightened

    Literally. As of writing, there are 10,787 pages on this wikia, and 11,084 articles in the numbers category.

    I'm mainly using this as an excuse to pick up the discussion which was dropped about a month ago from the comments here. Please have a quick read of them if you haven't yet.

    I believe the two popular ideas were to:

    • A) Consolidate similar-sized numbers from the same notation into one article each, possibly with a section on each number
    • B) Create a splinter site or forum, probably non-wikia based.

    I want to get this discussion going again. Both ideas appeal to me and honestly, I want to see us getting together and doing something towards these possible goals. It's better than deciding stuff should happen but not following through, so hopef…

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  • Emlightened


    \(B_0(\alpha,\beta) = \beta \cup \{0,1,\omega,\Omega,\Omega^+\}\)

    \(B_{n+1}(\alpha,\beta) = \{\gamma

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  • Emlightened

    The -ish is because I've never seen something like this presented, except for some type theories, which are much less useful.


    Primitive recursion is a simple method for creating total recursive functions. We can formalise it in such a way that (almost) any sufficiently slow-growing (sub \(\omega\) on the FGH) googological function can be encoded, and hence offers a way of proving that it is recursive and total.

    This can even be represented in a way that is easily understandable: zero, successor, projection and composition can be paid no heed when showing a function is PR, and only the recursion step needs to be stated explicitly - and even this can be represented in a simpler manner.

    Similarly, a simple extension of primitive recursion…

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