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Separating the eraser Turing machine classes \(L_ e\), \(NL_ e\), \(co- NL_ e\) and \(P_ e\). (English) Zbl 0749.68036
The main result of the paper consists in the following: there are strong differences in the computational power of deterministic, nondeterministic, co-nondeterministic and alternating eraser Turing machines. The technique of the proof is based on exponential lower and polynomial upper bounds for read-once-only \(\Omega\)- branching programs.

MSC:
68Q15 Complexity classes (hierarchies, relations among complexity classes, etc.)
68Q05 Models of computation (Turing machines, etc.) (MSC2010)
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