Consider the language $$L=\{x y^{(n)} z y^{(n)} w: x,z,w \in \Sigma^*, y \in \Sigma, z\text{ does not contain }y, n \geq 0 \}.$$ To show that the language is not regular using the Myhill-Nerode Theorem, I have to show that there are infinite number of equivalence classes, right? But how can I find these equivalence classes?
2026-04-01 10:22:29.1775038949
Applying the Myhill-Nerode Theorem
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