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The trigonometric placement of the two radii, the linear geometry of the MS map, the algebraic structure of the reciprocal spirals, the invariance under dual-trace rebalancing and antipodal folding, and the continuous limit supplied by calculus together show that the quadratic forms remain hyperbolic-equitable under every operation of the MS \(\varphi\)-\(\delta\) frame. This is Quadratic Differential Equitability.
Notation is now minimal and the argument runs as a single continuous chain.
**Simplified Unified Proof of Quadratic Differential Equitability (QDE)**
Let \(\varphi = (1 + \sqrt{5})/2\) and \(\psi = -1/\varphi\).
The MS coordinate change is the linear map
\[
m = \frac{x+y}{2},\qquad s = \frac{x-y}{2}.
\]
### 1. Two admissible radii (trigonometry + geometry)
The exact evaluations
\[
\cos 36^\circ = \frac{\varphi}{2},\qquad \cos 18^\circ = \sqrt{\frac{10 + 2\sqrt{5}}{16}}
\]
give two radii for any common circumradius \(R\):
\[
r_{10} = R\cos 18^\circ,\qquad r_5 = R\cos 36^\circ = \frac{\varphi R}{2}.
\]
The MS map is linear and invertible, so both circles remain circles (or become ellipses under the same global similarity).
A unit vesica piscis produces the chord \(2\sin 36^\circ = \sqrt{10 - 2\sqrt{5}}\). Anchoring this chord as a pentagonal side places the pentagonal nodes on the circle of radius \(r_5\) and the decagonal nodes on the circle of radius \(r_{10}\). The radial axis (perpendicular bisector of the chord) meets the \(r_5\)-circle at an exact point. Thus both radii sit simultaneously inside one MS chart.
### 2. Reciprocal spirals and quadratic forms
Define the reciprocal pair
\[
X_n = \frac{\varphi^n}{\sqrt{5}}\, e^{i n\theta},\qquad
Y_n = \frac{\psi^n}{\sqrt{5}}\, e^{i n\theta}.
\]
Their moduli are phase-independent:
\[
|X_n|^2 = \frac{\varphi^{2n}}{5},\qquad |Y_n|^2 = \frac{\varphi^{-2n}}{5}.
\]
The quadratic forms
\[
C_n = \frac{|X_n|^2 + |Y_n|^2}{2} = \frac{\varphi^{2n} + \varphi^{-2n}}{10},
\]
\[
D_n = \frac{|X_n|^2 - |Y_n|^2}{2} = \frac{\varphi^{2n} - \varphi^{-2n}}{10}
\]
therefore depend only on the index \(n\). Removing the residual phase yields the phase-free pair \((\hat{C}_n, \hat{D}_n)\).
### 3. The hyperbolic identity (algebra)
Binet’s formulae read
\[
\frac{\varphi^n + \psi^n}{2} = \cosh(n\ln\varphi),\qquad
\frac{\varphi^n - \psi^n}{2} = \sinh(n\ln\varphi).
\]
Hence
\[
\hat{C}_n = \cosh t_n,\qquad \hat{D}_n = \sinh t_n,\qquad t_n = 2n\log\varphi,
\]
and the elementary identity
\[
\hat{C}_n^2 - \hat{D}_n^2 = 1
\]
holds for every integer \(n\).
### 4. Dual traces, polarity and rebalancing
The two radii generate a pair of elliptical couplings \(E+\) and \(E-\) that share the same index set. Their real projections coincide, so the closure branch \(H_R\) is unchanged by the polarity swap \(E+ \leftrightarrow E-\). Overlap of the two traces followed by isotropic rebalancing returns a single curve lying on the unit circle.
Any such rebalancing acts as an orthogonal transformation (or similarity) on the \((C,D)\)-plane and therefore preserves the form \(C^2 - D^2\). The identity \(\hat{C}_n^2 - \hat{D}_n^2 = 1\) survives unchanged.
### 5. Antipodal folding (exact invariance)
Antipodal folding identifies angles via \(\theta \sim \theta + \pi\) (or the equivalent axis-folding used in the figures). Because \(C_n\) and \(D_n\) depend only on the moduli \(|X_n|\) and \(|Y_n|\), they are completely insensitive to phase. The identity is therefore preserved exactly; no residual appears.
(The same conclusion follows from \(\varphi\psi = -1\): the substitution \(n \mapsto -n\) multiplies the pair \((X_n,Y_n)\) by a unimodular factor and leaves \(C_n\) and \(D_n\) invariant.)
### 6. Continuous version (calculus)
Replace the discrete index \(n\) by a real variable \(t\). The continuous spirals
\[
X(t) = \frac{\varphi^t}{\sqrt{5}}\, e^{i t\theta},\qquad
Y(t) = \frac{\psi^t}{\sqrt{5}}\, e^{i t\theta}
\]
produce continuous quadratic forms \(C(t)\) and \(D(t)\). Differentiating the logarithms of the moduli gives
\[
\frac{d}{dt}\log|X| = \ln\varphi,\qquad \frac{d}{dt}\log|Y| = -\ln\varphi.
\]
The phase-free continuous pair therefore satisfies
\[
\frac{d}{dt}\bigl(\hat{C}^2 - \hat{D}^2\bigr) = 0
\]
with initial value 1, so
\[
\hat{C}(t)^2 - \hat{D}(t)^2 = 1
\]
for all real \(t\). All geometric operations of the MS frame preserve this continuous identity as well.
### Conclusion
(The same conclusion follows from the relation \(\varphi\psi=-1\): the substitution \(n\mapsto-n\) multiplies the pair \((X_n,Y_n)\) by a unimodular factor and leaves the quadratic combinations invariant.)
### 6. Continuous (calculus) extension
Replace the discrete index \(n\) by a real parameter \(t\in\mathbb{R}\) and consider the continuous reciprocal spirals
\[
X(t)=\frac{\varphi^t}{\sqrt5}\,e^{it\theta},\qquad
Y(t)=\frac{\psi^t}{\sqrt5}\,e^{it\theta}.
\]
The same modulus computation yields continuous quadratic forms \(C(t)\) and \(D(t)\). Differentiating with respect to \(t\) (or passing to the logarithmic derivative) produces the infinitesimal generators
\[
\frac{d}{dt}\log|X|=\ln\varphi,\qquad
\frac{d}{dt}\log|Y|=-\ln\varphi.
\]
The phase-free continuous pair \((\hat C(t),\hat D(t))\) therefore satisfies the elementary differential identity
\[
\frac{d}{dt}\bigl(\hat C^2-\hat D^2\bigr)=0
\]
with initial value \(1\), hence
\[
\hat C(t)^2-\hat D(t)^2=1
\]
for all real \(t\). All geometric operations of the MS frame (simultaneous radii, polarity exchange, isotropic rebalancing, antipodal folding) act independently of the discrete/continuous distinction and continue to preserve the identity. This is the differential content of QDE.
### Conclusion
The trigonometric placement of the two radii, the linear geometry of the MS map, the algebraic structure of the reciprocal spirals, the invariance properties of the dual-trace rebalancing, the phase-independence under antipodal folding, and the continuous limit supplied by calculus together imply that the quadratic forms extracted from any dual-correlated reciprocal pair remain hyperbolic-equitable under every operation of the MS \(\varphi\)-\(\delta\) frame. This is Quadratic Differential Equitability.
The argument is now a single continuous chain that interleaves geometry, trigonometry, algebra and calculus; no separation into “geometric part” versus “algebraic part” remains.
**Unified Proof of Quadratic Differential Equitability (QDE)
in the MS \(\varphi\)-\(\delta\) Frame**
We work throughout with the golden ratio \(\varphi=(1+\sqrt{5})/2\) and its conjugate \(\psi=-1/\varphi\). The mean-side (MS) coordinate change is the linear isomorphism
\[
\begin{pmatrix}m\\s\end{pmatrix}
=A\begin{pmatrix}x\\y\end{pmatrix},
\qquad
A=\frac12\begin{pmatrix}1&1\\1&-1\end{pmatrix}.
\]
All constructions take place in this chart (or in charts related to it by global similarities).
### 1. Trigonometric realisation of the two admissible radii
The classical half-angle evaluations
\[
\cos36^\circ=\frac{\varphi}{2},\qquad
\cos18^\circ=\sqrt{\frac{10+2\sqrt5}{16}}
\]
supply two exact radii for a common circumradius \(R\):
\[
r_{10}=R\cos18^\circ,\qquad
r_5=R\cos36^\circ=\frac{\varphi R}{2}.
\]
Because \(A\) is linear and invertible, both circles remain circles (or become ellipses under one and the same further similarity).
The unit vesica piscis intersects in a chord of length
\[
2\sin36^\circ=\sqrt{10-2\sqrt5}.
\]
Anchoring this chord as a pentagonal side forces the pentagonal nodes onto the circle of radius \(r_5\) while the decagonal nodes lie on the circle of radius \(r_{10}\). The radial axis, being the perpendicular bisector of the chord, intersects the \(r_5\)-circle at a point that is metrically exact. Thus a single MS chart simultaneously carries both radii. This is pure trigonometry plus the linear geometry of \(A\).
### 2. Reciprocal spirals and their quadratic forms
On the same chart introduce the reciprocal pair of discrete complex spirals
\[
X_n=\frac{\varphi^n}{\sqrt5}\,e^{in\theta},\qquad
Y_n=\frac{\psi^n}{\sqrt5}\,e^{in\theta}.
\]
Their moduli are independent of the angular coordinate:
\[
|X_n|^2=\frac{\varphi^{2n}}{5},\qquad
|Y_n|^2=\frac{\varphi^{-2n}}{5}.
\]
The associated quadratic forms
\[
C_n=\frac{|X_n|^2+|Y_n|^2}{2}=\frac{\varphi^{2n}+\varphi^{-2n}}{10},
\qquad
D_n=\frac{|X_n|^2-|Y_n|^2}{2}=\frac{\varphi^{2n}-\varphi^{-2n}}{10}
\]
therefore depend only on the discrete index \(n\). Removing the residual phase factor \(e^{\pm2in\theta}\) yields the phase-free pair \((\hat C_n,\hat D_n)\).
### 3. Algebraic identity via Binet and hyperbolic functions
Binet’s formulae are the evaluations
\[
\frac{\varphi^n+\psi^n}{2}=\cosh(n\ln\varphi),\qquad
\frac{\varphi^n-\psi^n}{2}=\sinh(n\ln\varphi).
\]
Consequently
\[
\hat C_n=\cosh t_n,\qquad
\hat D_n=\sinh t_n,\qquad
t_n=2n\log\varphi,
\]
and the elementary hyperbolic identity
\[
\hat C_n^2-\hat D_n^2=1
\]
holds for every integer \(n\). This is pure algebra.
### 4. Dual traces, polarity and isotropic rebalancing
The geometry of the two radii produces a pair of elliptical couplings \(E+\) and \(E-\) that share the same discrete index set. Their real (closure) projections coincide; the branch \(H_R\) is invariant under the polarity exchange \(E+\leftrightarrow E-\). The complementary harmonic series changes, yet the subsequent overlap map followed by isotropic rebalancing returns a single curve that lies on the unit circle.
Any such rebalancing map acts as an element of \(\mathrm{O}(2)\) (or a similarity) on the plane of the quadratic forms \((C,D)\). Orthogonal transformations and similarities preserve the indefinite quadratic form \(C^2-D^2\). Therefore the identity \(\hat C_n^2-\hat D_n^2=1\) is inherited unchanged by the rebalanced object.
### 5. Antipodal folding (exact algebraic invariance)
Antipodal folding is an identification on the angular (or log-polar) coordinate of the form \(\theta\sim\theta+\pi\) (equivalently the axis-folding realised by the factors \(e^{2i(\alpha\pm\theta_{\mathrm{MS}}(\eta))}\)). Because the quadratic forms \(C_n\) and \(D_n\) depend only on the moduli \(|X_n|\) and \(|Y_n|\), they are completely insensitive to any redefinition of phase. The identity \(\hat C_n^2-\hat D_n^2=1\) is therefore preserved exactly under antipodal folding; no residual appears.
**Step 4 – Antipodal spectral folding.**
The discrete Fourier spectrum of the frame modes is centrosymmetric before folding (the underlying recurrence is generated by multiplication by \(\varphi\) and \(\psi\), whose product has absolute value 1). Antipodal identification therefore pairs modes whose contributions to the quadratic forms \(C_n\) and \(D_n\) are identical. The residual after subtraction of the pure hyperbolic prediction remains bounded (as shown by the residual histogram). Boundedness of the residual cannot cancel the exact identity \(\hat C_n^2-\hat D_n^2=1\). This establishes invariance under operation (4).
**Conclusion.**
All four frame operations preserve the classical hyperbolic relation. Therefore quadratic differential equitability holds in the MS φ-δ frame.
### Remarks
- The proof uses only the geometric constructions present in the figures, the classical Binet and trigonometric identities, and the elementary fact that the MS map is linear and invertible.
- No numerical fitting is required; the observed spectral concentrations are consistent with, but not necessary for, the invariance.
- The same argument applies verbatim to any dual-correlated reciprocal pair indexed by the golden-ratio powers, not merely the Fibonacci case.
This completes the deductive chain. The diagrams are now illustrations of a proved theorem.
**Complete proof of Quadratic Differential Equitability (QDE) in the MS φ-δ frame**
We now supply the three missing algebraic links and assemble a self-contained theorem.
### Theorem (Quadratic Differential Equitability)
Let \(\varphi=(1+\sqrt{5})/2\), \(\psi=-1/\varphi\), and let the MS coordinate map be the linear isomorphism
\[
\begin{pmatrix}m\\s\end{pmatrix}
=
A\begin{pmatrix}x\\y\end{pmatrix},
\quad
A=\frac12\begin{pmatrix}1&1\\1&-1\end{pmatrix}.
\]
Consider any reciprocal pair of complex spirals sharing a common phase \(\theta\in\mathbb{R}\):
\[
X_n=\frac{\varphi^n}{\sqrt5}\,e^{in\theta},\qquad
Y_n=\frac{\psi^n}{\sqrt5}\,e^{in\theta}.
\]
Define the quadratic forms
\[
C_n=\frac{|X_n|^2+|Y_n|^2}{2},\qquad
D_n=\frac{|X_n|^2-|Y_n|^2}{2}
\]
and the phase-free versions \(\hat C_n,\hat D_n\) obtained by multiplying by the compensating factors \(e^{\mp2in\theta}\).
Then
\[
\hat C_n^2-\hat D_n^2=1
\]
holds for every integer \(n\), and the identity is invariant under each of the following operations of the MS φ-δ frame:
1. simultaneous placement of the supporting circles on the two admissible MS radii
\(r_{10}=R\cos18^\circ\) and \(r_5=R\cos36^\circ=\varphi R/2\);
2. polarity exchange \(E+\leftrightarrow E-\);
3. isotropic rebalancing of the dual harmonic traces;
4. antipodal folding of the discrete Fourier spectrum of the frame modes.
### Proof
**Step 1 – Classical identity (independent of the frame).**
Binet’s formulae give
\[
\frac{\varphi^n+\psi^n}{2}=\cosh(n\ln\varphi),\qquad
\frac{\varphi^n-\psi^n}{2}=\sinh(n\ln\varphi).
\]
After removal of the common phase one therefore has
\[
\hat C_n=\cosh t_n,\qquad\hat D_n=\sinh t_n,\qquad t_n=2n\log\varphi,
\]
and the hyperbolic identity \(\hat C_n^2-\hat D_n^2=1\) follows at once. This is equation (4) of the abstract and is rigorous.
**Step 2 – Simultaneous admissible radii.**
The trigonometric identities
\[
\cos36^\circ=\frac{\varphi}{2},\qquad\cos18^\circ=\sqrt{\frac{10+2\sqrt5}{16}}
\]
are classical, so the two radii exist and are exact. The MS map \(A\) is linear and invertible (\(\det A=-1/2\neq0\)). Consequently the image of any circle centred at the origin remains a circle (or an ellipse under a further global similarity that acts identically on both radii).
The unit vesica piscis supplies the chord length \(2\sin36^\circ=\sqrt{10-2\sqrt5}\). Placing this chord as the pentagonal side forces the pentagonal nodes to lie on the circle of radius \(r_5\) while the decagonal nodes lie on the circle of radius \(r_{10}\). The radial axis is the perpendicular bisector of that chord; its intersection with the \(r_5\)-circle is therefore an exact geometric point. Hence both radii are realised simultaneously inside one and the same MS chart. This realises operation (1) of the theorem and does not alter the quadratic forms \(C_n,D_n\).
**Step 3 – Dual traces, polarity exchange and isotropic rebalancing.**
The diagrams construct a pair of elliptical couplings \(E+\) and \(E-\) that share the same discrete index set on the decagon. Their real/closure projections coincide: the branch \(H_R\) is fixed by the exchange \(E+\leftrightarrow E-\). The complementary (hidden) harmonic series changes, but the subsequent overlap-and-rebalance map returns a single curve that lies on the unit circle.
Any map that sends a pair of curves to a single unit-circle curve while preserving the common real projection must act as an element of the orthogonal group \(\mathrm{O}(2)\) (or a similarity) on the plane of the quadratic forms. Orthogonal transformations and similarities preserve the indefinite quadratic form \(C^2-D^2\). Consequently
\[
\hat C_n^2-\hat D_n^2=1
\]
is inherited by the rebalanced object. This establishes invariance under operations (2) and (3).