Question: A Turing machine with a two - way infinite tape is a standard Turing machine except its tape extends infinitely to the left, as well

A Turing machine with a two-way infinite tape is a standard Turing
machine except its tape extends infinitely to the left, as well as to the right. Initially
the tape is filled with blanks except where the input is written, and the head is at
the leftmost input symbol. Computation proceeds as usual, except the head never
encounters a left end on moving left. Prove that with a two-way infinite tape, Turing
machines recognize no more than the standard class of Turing-recognizable languages..

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