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Oct 1, 2013 at 8:31 comment added Justin Noel Exactly, or one could check that the appropriate comma category is weakly contractible.
Sep 28, 2013 at 18:31 comment added Marc Hoyois Oh I see: putting $C'$ instead of $C$ in the lower right corner simply doesn't change the universal property of the pullback in the $(\infty,1)$-category of $(\infty,n)$-categories.
Sep 27, 2013 at 15:14 comment added Marc Hoyois Could you say a bit more about the "standard finality argument"?
Sep 27, 2013 at 11:09 history edited Justin Noel CC BY-SA 3.0
Added credit.
Sep 25, 2013 at 9:45 vote accept Justin Noel
Sep 25, 2013 at 9:42 history edited Justin Noel CC BY-SA 3.0
Added credit and fixed a comma
Sep 25, 2013 at 9:25 history answered Justin Noel CC BY-SA 3.0