Okay thanks, can you go to my stack exchange thread and tell me if I figured out my first question ( question A) correctly, I posted my solution to it at the bottom of the post.
Some background: I am self studying dynamics and I have encountered a fundamental problem with either my understanding of linear algebra, or I am just plain dumb. So, I print screened the page of the book we're on. Now let me try to reduce some ambiguity in my question, I have a general...