`BookProof.ChapterA3.hasAdLambda_sum` {ι : Type*} (s : Finset ι) (G A : ι → Matrix (Fin 4) (Fin 4) ℝ) (h : ∀ i ∈ s, HasAdLambda (G i) (A i)) : HasAdLambda (∑ i ∈ s, G i) (∑ i ∈ s,

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`BookProof.ChapterA3.hasAdLambda_sum` {ι : Type*} (s : Finset ι) (G A : ι → Matrix (Fin 4) (Fin 4) ℝ) (h : ∀ i ∈ s, HasAdLambda (G i) (A i)) : HasAdLambda (∑ i ∈ s, G i) (∑ i ∈ s, · Prove2Me