Deletion of Zipper theorem

Comment: as the entry and comment immediately above combine to show this is a non-otability|notable mathematical exercise (and the solution may be |original research). No evidence that this theorem has any role except as a textbook exercise in a single textbook, and OTTEXTBOOK|Wikipedia is not a textbook. Could possibly consider a transwiki to Wikiversity or Wikibooks but i'd be wary of the copyright implications of taking an exercise from a published book
Stance: delete
Cited policy: Wikipedia:Notability (WP:N||WP:NOTTEXTBOOK||WP:original research)

Comment: per  and due to general lack of noteworthiness
Stance: delete
Cited policy: Wikipedia:Wikipedia is not for things made up one day (WP:MADEUP)

Comment: per further input above...I am now convinced of the subject's non-notability (fails points 1 and 4 of |general notability guideline
Stance: delete
Cited policy: Wikipedia:Notability (WP:GNG)