Computers and Technology, 20.10.2020 20:01 mella98
Define a two-headed finite automaton (2DFA) to be a deterministic finite automaton that has two read-only, bidirectional heads that start at the left-hand end of the input tape and can be independently controlled to move in either direction. The tape of a 2DFA is finite and is just large enough to contain the input plus two additional blank tape cells, one on the left-hand end and one on the right-hand end, that serve as delimiters. A 2DFA accepts its input by entering a special accept state. For example, a 2DFA can recognize the language {anbncn | n }. Let A2DFA = { M, x | M is a 2DFA and M accepts x}. Show that A2DFA is decidable. Let E2DFA = { M | M is a 2DFA and L(M) = {}}. Show that E2DFA is not decidable.
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Define a two-headed finite automaton (2DFA) to be a deterministic finite automaton that has two read...
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