Question: One sometimes sees fallacious assertions that a language like E of this section is described by a regular expression. The argument is that for each

One sometimes sees fallacious assertions that a language like E of this section is
described by a regular expression. The argument is that for each n,0n1n is a regular expression
de ning the language with one string, 0n1n Thus,
0102120313
is a regular expression describing E. What is wrong with this argument?

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