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bio website mathscitech.org/articles location London, United Kingdom age member for 11 months seen May 17 at 16:59 profile views 24

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 May14 awarded Caucus Mar18 answered Book on advanced topics of Network Flows Mar18 awarded Excavator Mar18 revised Modelling a rail / underground / subway transportation systemExpanded title to better reflect the question --- underground is a particular subway system in London. This is about modelling transporation networks more generally. Mar18 suggested suggested edit on Modelling a rail / underground / subway transportation system Mar12 comment What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)@jwg: I get that. My comment wasn't suggesting that the first picture is unnecessary. It was rather to observe that depending on what 'first principles' one wishes to allow, one can build up a proof with different tools. So a pure geometric proof -- yes, both pictures, brilliant. Allow a little algebra with your geometry, and only one picture is required. With algebra only --- well, then you don't have a fact at all! -- Pythagorean theorem is the result of an axiom of a certain kind of metric space.... Mar8 comment What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)Allowing a little algbera, one wouldn't need the first picture, only the second: $(a+b)^2 = a^2 + b^2 + 2ab$ gives the area of the big square in terms of the two lengths. The triangles are right triangles and all four are congruent (SAS). The area for triangles is $\frac{1}{2}ab$ and there are 4 of them, for a total area of $2ab$. Since we are removing them from the big square to get the inner square, we are left with the identity: $(a+b)^2 - 4\frac{1}{2}ab = a^2 + b^2 = c^2$. Feb21 revised Poisson probability differs from combinatorial probability, why?Annotated the significant addition to the question so that it is not 'lost'. The OP did so, presumably in response to the two answers received, but did not call attention to the extension. Feb21 suggested suggested edit on Poisson probability differs from combinatorial probability, why? Feb21 revised Poisson probability differs from combinatorial probability, why?Elaborated on the extra questions. Feb21 answered Poisson probability differs from combinatorial probability, why? Feb19 answered Basic terms for the elements of an observation, sample? Dec31 comment Power set difference on the same set.@amWhy: cheers for that. Thx. Dec31 comment Power set difference on the same set.@Asaf: I'll second amWhy on my response as well. (And apologies to amWhy as well.) Dec31 comment Power set difference on the same set.Sorry -- I'd interpreted Victor's "yes" to in a comment as referring to the question "is this argument anything to do with Russell's Paradox" -- re-reading it (and the confusion above), that's probably not the case. Consider all these withdrawn! Dec31 suggested suggested edit on Power set difference on the same set. Dec31 awarded Critic Dec29 comment How do I read this question?Transcript resolving the problem. Dec29 comment How do I read this question?chat.stackexchange.com/rooms/6879/room-for-ake-and-limitless Dec29 comment How do I read this question?Jacobson (in my opinion) is not the clearest author, and I've also found understanding exactly what he means a tad challenging (frustrating?) Do you want to take this into a chat room? It may be quicker and easier there.