Question: Useless state means that a state is never entered during execution of any string regardless of membership. See the given two languages on useless states:

Useless state means that a state is never entered during execution of any string regardless of membership. See the given two languages on useless states:

USELESS

_{

PDAis a decidable problem, but USELESS

_

}

is undecidable.

What is the reason behind? How do you relate these two languages with programming languages, and the programs written?

Useless state means that a state is never entered during execution

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