I want to prove that a language is not $\omega$-regular.
The language I'm working with can be defined as:
$$L = \{ a_1 \dots a_n x^\omega ~ | ~ n > 0, a_1 \dots a_n \in L^\prime \}$$
where $L^\prime$ is a specific non regular language (I omit the definition $L^\prime$ because I think it is of no help for my problem), $a_i$ are symbols in $L^\prime$ alphabet and $x$ is any symbol not in $L^\prime$ alphabet.
I'm aware of several proof techniques for proving a language is not regular (see e.g. How to prove that a language is not regular?How to prove that a language is not regular? ).
Are there similar proof techniques for proving that a language is not $\omega$-regular?