Question 1 Which of the following is true about mapping reducibility? | A necessary condition for mapping reducibility is: w E A + f(w) E B | A necessary condition for mapping reducibility is: w £ A → f(w) ¢ B Mapping reducibility can be used to show a language is recognizable. Mapping reducibility can be used to show a language is undecidable. Mapping reducibility can be used to show a language is decidable. Question 2 To show that a language is not decidable, one could | reduce it to an undecidable language. | reduce an undecidable language to it. | show that it is not recognizable. use the Church-Turing thesis. | ask 1000 people to write a program for it and find out that none of them can.

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