reference request: John Baez on (-1)- and (-2)-categories and properties+structure+stuff - MathOverflow most recent 30 from http://mathoverflow.net 2013-06-19T18:54:09Z http://mathoverflow.net/feeds/question/80372 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/80372/reference-request-john-baez-on-1-and-2-categories-and-propertiesstructur reference request: John Baez on (-1)- and (-2)-categories and properties+structure+stuff Aaron Mazel-Gee 2011-11-08T10:37:21Z 2011-11-08T10:49:30Z <p>I vaguely recall reading a long time ago a 50-or-so page paper, either by John Baez or linked from his page (I think the former), which among other things gave a justification for his table of n-categories and a very cute explanation of the realization that really it should start at n=-2. I believe this paper also introduced (to me) the ideas of properties, structure, and stuff. I was just thinking about how I'd love to look back at this, but among the wealth of resources available on Baez's webpage I can't seem to find what I'm looking for. Googling hasn't turned it up either. Does anyone know what paper I'm talking about? And if it doesn't talk about properties, structure, and stuff, can anyone recommend a friendly and polished exposition of these ideas?</p> http://mathoverflow.net/questions/80372/reference-request-john-baez-on-1-and-2-categories-and-propertiesstructur/80375#80375 Answer by GonĂ§alo Marques for reference request: John Baez on (-1)- and (-2)-categories and properties+structure+stuff GonĂ§alo Marques 2011-11-08T10:49:30Z 2011-11-08T10:49:30Z <p>I think you mean the paper <a href="http://arxiv.org/abs/math/0608420" rel="nofollow">"Lectures on n-Categories and Cohomology"</a>. You can also look at the appropriate pages at the <a href="http://ncatlab.org/nlab/show/HomePage" rel="nofollow">nLab</a>. </p>