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def definition def or abbrev

opticalTheoremFormula

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formal statement (Lean)

 162def opticalTheoremFormula : String :=

proof body

Definition body.

 163  "σ_total = (4π/k) × Im[f(θ=0)]"
 164
 165/-- **THEOREM**: The optical theorem follows from probability conservation.
 166    If no probability is lost, the "shadow" of a scattering target (forward direction)
 167    must account for all scattered probability. -/

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