Question: Briefly explain why the construction from the answer to Problem 3 . 1 5 ( a ) does not show that RE ( the class

Briefly explain why the construction from the answer to Problem 3.15(a) does
not show that RE (the class of recursively enumerable (or Turing-recognizable)
languages) is closed under union. (The answer to Problem 3.16(a) may be helpful.

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