anthonyquas
Reputation
414
Next privilege 500 Rep.
Access review queues
 Mar 17 comment Normalisation of an invariant measure Ilya's example was $P$ is the identity matrix. Then every measure is an invariant measure; and so you can take one then somehow do a weird normalization. The "right question" is to ask for an irreducible Markov chain with this property. Then the answer is no. The issue is that infinite invariant measures arise for null recurrent Markov chains; whereas finite invariant merasure arise for positive recurrent Markov chains. Mar 8 comment An elementary conditional probability question The formula appears to describe the following thing: you have a bunch of tests: $1$ to $N$ which accept or reject emails as spam or not; it appears to be assumed that the outcomes of all of these tests are independent. If some tests are passed and some are failed, you are in an indeterminate case. The formula appears to compute the probability of passing all the tests given that you are in the determinate case. Whether this is meaningful, I leave to the computer science types to explain. Feb 2 comment Total measure and Riesz theorem Is this a homework question? Jan 20 comment Cardinality of collection of subfields of $\mathbb C$ Thank you. I guess this is obvious if you know about transcendence bases. Jan 20 accepted Cardinality of collection of subfields of $\mathbb C$ Jan 20 comment Cardinality of collection of subfields of $\mathbb C$ Thanks - I'm surprised google didn't pull up your question. I did look first. Jan 20 asked Cardinality of collection of subfields of $\mathbb C$ Jan 18 accepted roots of multi-variable polynomials and extension fields Jan 9 awarded Curious Jan 8 comment roots of multi-variable polynomials and extension fields I'm reminded of a comment by Miles Reid, who said (I think) that the level of questions that AG people are asked by non-AG people is analogous to the level questions asked by non-mathematicians of mathematicians. Jan 8 comment roots of multi-variable polynomials and extension fields Thanks again! I really had in mind $K=\mathbb Q$, but this struck me as a fairly obvious question (it arose from a discussion with a colleague about an integration formula due to Gauss), and I was embarrassed to have no idea about the answer. Jan 8 awarded Yearling Jan 8 comment roots of multi-variable polynomials and extension fields can i ask 1 more question: is this the lowest tech answer that's possible?(there are quite a lot of words in it that I have heard before, but have no idea what they mean). Jan 8 comment roots of multi-variable polynomials and extension fields Thanks Qiaochu. Jan 8 asked roots of multi-variable polynomials and extension fields Aug 19 comment Orbit closures of symmetric bilinear form en.wikipedia.org/wiki/Symmetric_bilinear_form Jun 16 comment How often does a one-dimensional lazy random walk end at the origin? This doesn't really seem like a suitable question here to me. Apr 17 comment Integer solution to the equation Ummm.. (1) this is not linear algebra; and (2) where does this problem come from? Jan 28 accepted Measurability Question? Jan 28 comment Measurability Question? @PaulMcKenney: In that case it is direct. I just didn't know the definition. Thanks!