Deletion of Mathematical jargon

Comment: Mathematical jargon is more than simply an idiosyncratic verbalization of otherwise expressible concepts; it is the means by which mathematicians express those concepts at all.  See #Wikipedia is not a dictionary, in particular the exception enunciated in point 3.  I also second pat8722 regarding the lack of evidence that either Frühstücksdienst or Hetar has any mathematical expertise.  In fact, both of them seem to specialize in participating in or initiating AfD proposals more than anything else
Stance: keep
Cited policy: Wikipedia:What Wikipedia is not (WP:NOT)

Comment: Looking at all these "not a dictionary" AfDs looks like Wikipedia ''is'' occasionally a slang/idiom guide. Not making a value judgement here; just noting that maybe the |official policy is somewhat lacking in its spirit or wording
Stance: comment
Cited policy: Wikipedia:Wikipedia is not a dictionary (WP:WINAD)