**UNDELETED but still CLOSED** 

I want to know why the reason for closure of [this](https://math.stackexchange.com/questions/3964221/prove-that-minor-of-any-order-of-an-orthogonal-matrix-a-is-equal-to-its-cofact) question has been given as:

>Questions about choosing a course, academic program, career path, etc. are off-topic. Such questions should be directed to those employed by the institution in question, or other qualified individuals who know your specific circumstances.

I do not see any reason for closure of this question.