I disagree. I would call this a proof but not a derivation. In other words, each step follows logically from the previous ones, even if there&#x27;s no way that you would discover the final equations this way if you didn&#x27;t already know or guess them.<p>In general, this is part of what makes reading mathematical papers so difficult; the steps of the proofs are almost never written down in the order they were discovered. All of the false starts and a lot of the intuition is discarded to yield a shorter but sometimes totally mysterious path from the assumptions to the conclusion.