[No response from the OP, so I will leave this lie. I'm not that keen that I'm going to chase it up]
The question How to sort differential equation list? seems to me to be not uninteresting. The original asked about how to sort a list of DEs in Maple, but it's not really the Maple content that the asker is interested in, but rather if there is some ...
The closure of this question seems rather rude to me, in particular in view of the strong gender bias on this site. -- Also I think neither its vote score nor that of its five upvoted answers supports the claim that it is considered off-topic on this site. Therefore I suggest to reopen that question.