This question already has an answer here:

Been trying to figure it out for an hour myself and another hour looking around, I cannot find anything with the $c^{mn}$ part.

$$L=\{a^mb^nc^{mn}\mid m>n\}$$


marked as duplicate by Raphael Nov 24 '18 at 11:04

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ What have you tried? Where did you get stuck? We do not want to just hand you the solution; we want you to gain understanding. However, as it is we do not know what your underlying problem is, so we can not begin to help. See here for tips on asking questions about exercise problems. If you are uncertain how to improve your question, why not ask around in Computer Science Chat? $\endgroup$ – Raphael Nov 24 '18 at 11:06