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(23) and the next display, p. 35 — summed decrease: F(β⁽¹⁾) − F(β⁽ᴹ⁺¹⁾) ≥ M(L − L₀)/2 · min ‖β⁽ᵐ⁺¹⁾ − β⁽ᵐ⁾‖² · Prove2Me