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 May 1 comment Whats the intergral of xe^-y dy dx with 0 and 1 as limits Often a second symbol is omitted, though it is a bit ambiguous in this case. I'd read it with [0,1] for both integrals. But reading it as an indefinite integral over x might be valid too. Apr 24 comment Does relative positive definiteness have a good name? @PavelJiranek This little exchange has helped me figure out what I need to write. Thanks :) Apr 24 comment Does relative positive definiteness have a good name? @PavelJiranek Indeed. The thing I'm trying to articulate in the thing I'm writing is just a sense of "bigger", that's about all that matters for my purposes. This kind of technicality (and quarrel) poses a real danger of distracting the reader from what should be a really simple and intuitive point, as well as confusing and alienating them. Apr 24 revised Does relative positive definiteness have a good name? not *semi* definite Apr 24 comment Does relative positive definiteness have a good name? @PavelJiranek Oops, I'll edit it. The point of avoiding it is that most people will be unfamiliar with the idea of partial orderings. I'm already asking my audience to grapple with a number of unfamiliar topics. I don't want to make it worse if I can help it. Apr 24 comment Does relative positive definiteness have a good name? That's an excellent suggestion. Apr 24 asked Does relative positive definiteness have a good name? Apr 21 awarded Custodian Apr 21 reviewed No Action Needed How to mathematically calculate the indistinguisable and distinct of the following permutation problems? Oct 6 awarded Yearling Jul 5 comment Difference of two exponential RVs insularity of [my] analysis", perhaps just say that, instead of pretending that you actually care about what I have to say. It would save us both a lot of time. Jul 5 comment Difference of two exponential RVs Yes - we did not reach the said conclusions, you did, passing your own judgement off like we'd actually discussed it, agreed, and come to some mutual agreement is rude. You were pretty adamant that you didn't follow what I was saying, so I do not see how that could be the case, unless you were only feigning ignorance, which would be both rude and annoying. Yes, there are plenty of mathematicians who like the notion that mathematical truth is detached from reality, not saying your one of them, but they most definitely exist. Now, if you do indeed wish to "[draw] my attention to the ... Jul 5 comment Difference of two exponential RVs Not really, that would most likely be choosing your description so that the maths is easy, not for the type of simplicity described by the pragmatic maxim. // we is the incorrect personal pronoun here (and typically rude) - the advantage is realism, whilst I understand that doesn't matter for many mathematicians, it does to others. Just because I think using $1_x$ is stupid, does not mean that I do not know why others choose to use it, in fact I use it myself sometimes, but I still consider it to be a hack. Likewise, writing a computer algebra system that way would end in disaster. Jul 4 comment What does δA mean in differentiation? That's by Leonard Susskind right, from his online lectures I thought he was quite a good teacher - are you using those too? Jul 4 comment Generalised logaritmic function Cool, seems the problem is much deeper than I thought when I wrote the question. Jul 3 comment “universe” in set theory and category theory Just thought I should add that the "universe of discourse" is used more widely than mathematics, usually referring to a group of people sharing similar assumptions discussing the similar things (though not usually a set) Jul 3 comment Comparing uniform priors I am. I have seen this problem a number of times, have explained it below... Jul 3 revised Comparing uniform priors added another answer... Jul 2 asked Generalised logaritmic function Jun 25 comment Sparse least-squares fitting of discrete probability distributions @Piostruk do let me know how you get on. I would be interested the approach you end up taking.