titles I removed a definition of the macro stab in the title: math.stackexchange.com/posts/783745/revisions

search posts I did not find posts containing undefined \stab: data.stackexchange.com/math/revision/972953/1205843/… data.stackexchange.com/math/revision/1066861/1318473/…

search comments I found no comments with \stab: data.stackexchange.com/math/query/556789/… data.stackexchange.com/math/revision/1066862/1318474/…

search comments No comment with \stab using the two newer queries either: data.stackexchange.com/math/revision/1066863/1318475/… data.stackexchange.com/math/revision/1066865/1318477/…

search posts comments As mentioned before, when searching for \ve as a string I should be careful not to catch \vec, \vert, etc. data.stackexchange.com/math/revision/990313/1225806/… data.stackexchange.com/math/revision/1066865/1318477/…

Probably the queries that look also for macro definition are going to be more reliable. (Although since I found nothing using the above queries, the other ones are very likely to be emptyhanded, too.)

search posts comments Nothing else with \ve: data.stackexchange.com/math/revision/1066861/1318473/… data.stackexchange.com/math/revision/1066862/1318474/…

search comments And no occurrence of \ve with the queries checking macro definitions on the question and the other answers, either. data.stackexchange.com/math/revision/1066863/1318475/… data.stackexchange.com/math/revision/1066865/1318477/…