III. return the bill to Congress for clarification on some point within the bill IV. allow the Congress to pocket veto the bill, thereby allowing the bill to become law without his signature a.
Decidability. Definition: A language is called decidable if there exists a method-any method at all-to determine whether a given word belongs to that language or not. Working hypothesis I: Decidability is well defined above.roof: Surely, a decidable language is recognizable. Moreover, if a language is decidable, then so is its complement, and hence that complement is recognizable. Now suppose a language L and its complement are recognizable. Let A be a recognizer for L, and B for its complement.
A language is Recognizable iff there is a Turing Machine which will halt and accept only the strings in that language and for strings not in the language, the TM either rejects, or does not halt at all.Note: there is no requirement that the Turing Machine should halt for strings not in the language.ef: A Language is called Turing Decidable if some Turing Machine decides it. Keeping it simple-A language $L$ is Turing Decidable if some decider $M$, decides it. For more information you can refer to: An Introduction to the Theory of Computation by Michael Sipser.