Question: Prove that (a) (L + M)* = L* + M* (b) (cL)* = cL* for c R (c) (L*)* = L (d) (L-1)* =

Prove that
(a) (L + M)* = L* + M*
(b) (cL)* = cL* for c ∈ R
(c) (L*)* = L
(d) (L-1)* = (L*)-1

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