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structure definition def or abbrev

SecondOrderTransition

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formal statement (Lean)

 105structure SecondOrderTransition where
 106  critical_exponents : List ℝ  -- α, β, γ, ν, etc.
 107  universality_class : String   -- Ising, XY, Heisenberg, etc.
 108
 109/-- In RS, second-order transitions involve:
 110    1. J-cost minima merge smoothly
 111    2. Single minimum flattens at Tc
 112    3. Fluctuations diverge (critical opalescence)
 113    4. Universal behavior from J-cost geometry -/

depends on (3)

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