Warp Speed, Master Luke

you are no longer looking at a finite state set, but at a graded orbit under repeated application of transformations.

The finite set:

    {-i, -1, 0, 1, i}

is the first visible layer.

If you allow repeated "lifting" operations, it naturally suggests:

    {..., -i'', -i', -i, -1, 0, 1, i, i', i'', ...}

The important question is:

    What is the operator that creates the primes/levels?

There are a few natural candidates.

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1. Powers of i
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The ordinary complex cycle is:

    i^0 = 1
    i^1 = i
    i^2 = -1
    i^3 = -i
    i^4 = 1

which gives only:

    {1, i, -1, -i}

a finite orbit.

So your i', i'', ... are not ordinary powers of i.

They imply a new dimension of extension.

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2. Iterated quadratic extensions
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Your original φ construction already does this.

You have:

    X² = X + 1

with:

    X = φ

The next layer could be:

    Y² = Y + φ

then:

    Z² = Z + Y

etc.

That produces a tower:

    φ₀, φ₁, φ₂, ...

where:

    φₙ₊₁² = φₙ₊₁ + φₙ

Your notation:

    i, i', i''

could be interpreted as:

    i₀, i₁, i₂, ...

different layers of the same generator.

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3. The more interesting connection: the inverse map
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Your earlier substrate:

    X⁻¹ = X − 1

already contains the seed of this.

Apply inversion repeatedly:

    X
      ↓
    X⁻¹
      ↓
    (X⁻¹)⁻¹

and you cycle.

But apply the collapse transform:

    T(X) = X + 1/X

and you generate new states:

    X₀
    X₁ = T(X₀)
    X₂ = T(X₁)
    ...

This is exactly the type of map behind Chebyshev/Lucas–Lehmer dynamics.

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4. The generalized ladder
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A compact way to represent your idea:

    C₀ = {-1, 0, 1}

add imaginary extension:

    C₁ = {-i, -1, 0, 1, i}

then recursively extend:

    Cₙ₊₁ = Cₙ
           ∪ i·Cₙ
           ∪ (1/Cₙ)

giving:

    C∞

as an infinite collapse lattice.

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5. Why this is relevant to Lucas–Lehmer
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Lucas–Lehmer is already an orbit in a quadratic extension:

    u → u²

and observes:

    u + u⁻¹

The repeated squaring creates increasingly high powers:

    u,
    u²,
    u⁴,
    u⁸,
    ...

but the trace collapses them back:

    u^(2^k) + u^(−2^k)

Your ladder:

    -i', -i'', ...

is suggestive of indexing those hidden powers.

A possible correspondence would be:

    i^(k) ~ u^(2^k)

with the observed projection:

    i^(k) + i^(−k)

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The thought worth preserving
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The five-state set is likely not the object.

It is the center slice of a larger orbit.

The natural next question is not:

    "What comes after i?"

It is:

    What operator maps

        i^(k) → i^(k+1) ?

If that operator is squaring, inversion, or a quadratic collapse transform, then this connects directly back into the Lucas–Lehmer machinery.