Question: Prove that a language A is TM-recognizable if and only if there exists a decidable language B such that A = {x|ReverseElement y s.t. (x,

Prove that a language A is TM-recognizable if and only if

Prove that a language A is TM-recognizable if and only if there exists a decidable language B such that A = {x|ReverseElement y s.t. (x, y) Element B} (in other words, B is such that for every x we have that x Element A doubleheadarrow ReverseElement y (x, y) Element B)

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