I am trying to figure out how to prove a language that is nonregular with using Myhill-Nerode theorem.
Here I have
x^n y^n x^n = {xyx xxyyxx xxxyyyxxx ...}
How would I be able to do this ? Would I just say , the language is nonregular because here we observe that the strings xyx xxyyxx xxxyyyxxx... are all in different classes ?