theorem proved term proof

`lambda_RS_val`

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formal statement (Lean)

 106theorem lambda_RS_val : lambda_RS = 1 / 2 := rfl

Term-mode proof.

 107
 108/-- The Higgs mass squared from the Mexican hat potential: m_H² = 2λv².
 109    With λ = 1/2: m_H² = v². -/

Lean names referenced from this declaration's body.