Deletion of Duality (mathematics)

Comment: This is a  if ever there was one.  If the article is crappy, it should be fixed.  The stated reason for deletion, "I have never seen the word "dual" or the concept of duality itself defined or discussed in mathematical literature" is a phenomenal admission of both ignorance and indolence, as ''any'' trivial web or literature search would have turned up dozens of examples.  (http://www.google.com/search?q=site%3Amathworld.wolfram.com+dual Search for "dual" on MathWorld.)  I would hope that nominator recognizes that this nomination was a serious mistake
Stance: keep
Cited policy: Wikipedia:Snowball clause (WP:SNOW)

Comment: The article has no sources and appears to be improper |synthesis or |original thought
Stance: delete
Cited policy: Wikipedia:No original research (WP:SYN||WP:OR)

Comment: Consider renaming this to List of duality concepts in mathematics (or similar).  This article serves an encyclopedic purpose as a well-annotated |list for navigating related concepts
Stance: keep
Cited policy: Wikipedia:Lists (WP:LIST)