1) Construct a 2 × 2 examples to prove the followingstatements:
(a) λ ∈ σ(A) and µ ∈ σ(B) 6=⇒ λ + µ ∈ σ(A + B).
(b) λ ∈ σ(A) and µ ∈ σ(B) 6=⇒ λµ ∈ σ(AB).
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