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theorem proved term proof

DC_sigma_zero

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formal statement (Lean)

  95theorem DC_sigma_zero :
  96    jointSigma ⟨.defect, .cooperate⟩ = 0 := rfl

proof body

Term-mode proof.

  97
  98/-! ## §2. σ-conservation predicate
  99
 100A joint outcome is σ-conservative iff its σ ≥ 0; it preserves or
 101creates coordinated value.  Mutual defection is the unique
 102σ-violator in the four-outcome space.
 103-/
 104
 105/-- σ-conservative outcomes: mutual cooperation or mixed. -/

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