Question: Prove that if L1 and L2 are Turing-recognizable languages, then the language L1 L2 is also Turing recognizable, where we define: L1 L2 = {w

Prove that if L1 and L2 are Turing-recognizable languages, then the language L1 L2 is also Turing recognizable, where we define:

L1 L2 = {w | w L1 and w L2}.

(Hint: Use a k-tape Turing machine in your construction.)

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