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theorem proved term proof

r_min_pos

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formal statement (Lean)

 116theorem r_min_pos : 0 < r_min :=

proof body

Term-mode proof.

 117  Real.sqrt_pos_of_pos (div_pos alpha_strong_pos stringTension_pos)
 118
 119/-- α_s/σ is positive (both terms are positive). -/

depends on (7)

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