Question: Consider the following languages A ^ { forall } = left { | M text { is a TM that
Consider the following languages
AforallleftMtextis a TM that accepts all strings of length less than kright
and
AexistsleftMtext is a TM that accepts some strings of length less than kright
Note the difference between the languages all strings vs some strings
To show a language L is Turingrecognizable, we need to build a TM that behaves as follows:
TM on input w:
The TM accepts if
TM rejects or loop if
To show a language L is Turingrecognizable, we need to build a TM that behaves as follows:
TM on input w:
The TM accepts if win L
TM rejects or loop if w
otin L
True
False
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