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theorem

RCLCombiner_isCoupling_iff

proved
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module
IndisputableMonolith.Foundation.BranchSelection
domain
Foundation
line
145 · github
papers citing
43 papers (below)

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IndisputableMonolith.Foundation.BranchSelection on GitHub at line 145.

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 142  simpa using hc
 143
 144/-- **The RCL combiner is a coupling combiner iff `c ≠ 0`.** -/
 145theorem RCLCombiner_isCoupling_iff (c : ℝ) :
 146    IsCouplingCombiner (RCLCombiner c) ↔ c ≠ 0 := by
 147  rw [isCouplingCombiner_iff_interactionDefect_nonzero]
 148  constructor
 149  · rintro ⟨u, v, huv⟩
 150    intro hc
 151    apply huv
 152    rw [interactionDefect_RCLCombiner, hc]
 153    ring
 154  · intro hc
 155    exact ⟨1, 1, RCLCombiner_nonzero_couples c hc⟩
 156
 157/-! ## Branch Selection Theorem -/
 158
 159/-- **Branch selection by non-degeneracy.**
 160
 161If the RCL polynomial combiner is required to be a coupling combiner
 162(the strengthened (L4*) of the companion paper), then the parameter
 163`c` is forced to be nonzero. Equivalently, the additive branch
 164(`c = 0`, with calibrated representative `½(ln x)²`) is excluded.
 165
 166This is the branch-selection theorem of `RS_Branch_Selection.tex` in
 167its Lean form. The bilinear branch is forced; `J` is the
 168`α = 1` representative of the bilinear `α`-family. The residual
 169`α`-coordinate freedom is acknowledged in §5 of the paper and is
 170addressed by separate generator-calibration / higher-derivative /
 171action-functional conditions, none of which are part of the
 172operator-level Aristotelian content. -/
 173theorem branch_selection (c : ℝ)
 174    (hCoupling : IsCouplingCombiner (RCLCombiner c)) :
 175    c ≠ 0 :=