Maybe it could be called book-errata? I cannot give many examples of discussions from math.SE offhand but at least one example from here Find limit of unknown function This is an example from a different forum: http://www.sosmath.com/CBB/viewtopic.php?p=181367 I guess questions (and answers) r...

I created a new proposal at area 51 its called Math Review (http://area51.stackexchange.com/proposals/90443/math-review) and it is intended to be a Q&A site concerning troubles one find while reading text books and articles. Most of them are bad typos, but not always, for instance I recently fou...

In the definition of martingales, one finds in Stroock and Varadhan (Multidimensional Diffusion processes - page 20) the strange request that it be right-continuous process. However no such requirement is made in the wiki https://en.wikipedia.org/wiki/Martingale_%28probability_theory%29 no...

In the book Multidimensional diffusion processes, of Stroock and Varadhan one reads (page 23): This is the proof of $(i)$. Here the authors say Define $f_t$ on $(\{\tau \leq t\}, \mathcal{F}_t [\{\tau \leq t\}])$ What is the $\sigma$-algebra $\mathcal{F}_t [\{\tau \leq t\}]$? Is it $\{...

This is a meta meta question on the principles by which we should decide which tags to create. The motivation for the question stems from this meta discussion, in which a majority thought that there shouldn't be an errata tag, whereas a significant minority of $5$ upvoted my answer saying there s...