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Is infinite union of non-regular languages always$L_i$ that form a chain such that $L_i\subseteq L_{i+1}$ always non-regular?
Or is there a possibility that it be ever regular?
Is there an easy way to see this?
Is infinite union of non-regular languages always non-regular?
Is infinite union of non-regular languages $L_i$ that form a chain such that $L_i\subseteq L_{i+1}$ always non-regular?
