Thanks for the explanation. I wish I knew about the article Combinatorial principles. My intention was not to write an article but just to give temporary information to all who would want to help me 
 in my little project... someone should make this template (popcat) more popular in various help pages... 
 :You're probably right about that. Still, there's a basic guideline on Wikipedia is that if something is worth a category, it should at the very least have an article about it, so having the article was a good idea anyway! |