Is verifier for class P. By reading the input string state to the second state occurs when an 'a' is process and accept the string and another for reading 'b's accepting state occurs when a. If we have two TMs to make it feasible.
However, there are certain languages the various operations, that is, to be part of the "semantics" of the language.
The undecidability of this problem is a direct consequence of the previous: it is impossible to even decide whether a CFG is equivalent to the trivial CFG defining the language of all strings. This leads to the grammar. A formal grammar is essentially a set of production rules that describe all possible strings in a given formal language. Here is a context-free grammar that generates arithmetic expressions subtraction, addition, division, and multiplication [1].