<p><strong>I am sympathetic with the idea but believe it could not be used much.</strong></p>

<p>Most people asking questions on this site have <em>statistical</em> concerns.  If they want derivations they usually begin (and end) on the <a href="https://math.stackexchange.com/">math.SE</a> site (where "analytical derivation" would certainly be meta).  Moreover, your long list of putative synonyms belies the inherent ambiguity of the concept.  "Analytical," "algebraic," "symbolic," "formula," "derivation," and "calculus" mean distinctly different things and have different applications and uses.  If somebody really did label a question here with any of those things, I suspect the high-rep community members would quickly migrate it to the math site.</p>

<p>It is especially telling that to date (3000+ questions) <em>nobody</em> has ever attempted to tag their question here with something like "analytical-derivation" or "symbolic", etc.   Although on occasion such a tag could usefully discriminate more theoretical questions from practical ones, it tells me your proposal is acting like a solution in search of a problem.  Why not wait until people with actual questions create tags like this?</p>

<p><strong>I like your use of the word "evolve":</strong> that suggests that a tag should emerge from a few actual successful uses by questioners, become recognized through repeated use as legitimate, acquire a wiki entry, and accumulate a few followers or appear in searches.  At that point it would make sense to retroactively apply the <em>evolved</em>, mature tag to older questions.</p>

<p><strong>Note that tags are applied to questions, not replies.</strong>  It is tempting to retag questions in light of the answers received, but one should be cautious about such retroactive labeling.  It is appropriate to do so when the question itself is edited to reflect a new understanding of possible solutions.</p>
