This thread is a glowing reminder of how effective and friendly the HN community can be, when good will is extended in both the question and the answer. Thank y

This thread is a glowing reminder of how effective and friendly the HN community can be, when good will is extended in both the question and the answer. Thank you to all who contributed as the comments have provided me (and many others I'm sure) with a clear and concise map of the matrix calculus full of helpful resources. My 4th of July beach reading is now complete.