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theorem proved term proof

extraction_cost_minimum_at_zero

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formal statement (Lean)

 154theorem extraction_cost_minimum_at_zero :
 155    ∀ σ : ℝ, extractionSystemCost 0 ≤ extractionSystemCost σ := by

proof body

Term-mode proof.

 156  intro σ
 157  rw [show extractionSystemCost 0 = 0 from (extraction_cost_eq_zero_iff 0).mpr rfl]
 158  exact extraction_cost_nonneg σ
 159
 160/-- σ = 0 is the STRICT global minimum for σ ≠ 0. -/

depends on (9)

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