cobaltduck
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 May 14 answered Gift advice: present for high school graduate interested in math Apr 7 awarded Notable Question Mar 31 revised A Card game problem related to Markov chain corrected a "bug" in the code and result Mar 28 answered A Card game problem related to Markov chain Mar 19 comment Aunt and Uncle's fuel oil tank dip stick problem @user135539: Do you have any links or other specifics of this publication, and the issue that contained your husband's problem? I would love to read and learn more about this, especially if you can lead me to the fabled and elusive solution "using only plain arithmetic" I have heard rumors about. Dec 4 revised Is there a term for any number that is $2^n$? little bit of grammar changes Sep 5 comment Why do you add +1 in counting test questions? I first noticed this phenomenon in elementary school, where the baseball field's backstop had three sections of netting between four poles. I never knew this idea actually had a name, and was related to fences. Aug 16 revised Is there a term for any number that is $2^n$? Answering the objections of downvoters and commenters Aug 15 comment Is there a term for any number that is $2^n$? This post on SO makes use of the term: stackoverflow.com/questions/9259952/…, so I'm not the only one calling it as such. Very curious that this got four down votes but was the OP's accepted answer. Aug 15 answered Is there a term for any number that is $2^n$? Jul 26 comment Prove that the distance between a black and a white dot is one One could exploit a technicality in that the question fails to define "one unit." Arbitrarily select one black point and one white point. Define the distance between these points to be one unit. QED. Jul 20 comment Mathematical writing: why should we not use the phrase “we have that”? If ever there was a case for being able to cross-list questions on multiple SEs, this is it. I think the English SE community would have as much to input about this as Math SE, and each would benefit from the other's insights. Jun 20 comment How to solve a system of 2 equations in this form This may also help you get started: en.wikipedia.org/wiki/Conic_section#Intersecting_two_conics Jun 20 comment intersection of two graph To put it simply, the graph of $f$ is a V shape, and each of the possible answers is a line. Choices A and B would look like $\underline{V}$, just with different amounts of space between the V and the underline, and choices C and D would look like V /, again just with different spacing between the V and the /. Only in choice E will the slash cut through the vee. May 19 comment Why is 987654321/123456789 = 8.0000000729? Unrelated, but ever notice that Sqrt(9.87654321) approximates pi? The number system is full of this kind of stuff. May 12 comment How to represent the floor function using mathematical notation? What do you mean by that big capital pi with all those other symbols around it? Can you describe that "without words" please? In your accepted answer, what does arctan mean? My point is, all notation was invented to describe some intellectual phenomenon, which may in turn have been based on some earlier idea, etc. until the whole thing ultimately boils down to cavemen telling how many mastadon had been successfully hunted by holding up fingers. May 6 awarded Caucus Apr 2 comment Is 1+1 =2 a theorem? The fact that I can describe a system (such as the integers modulo 2) where 1 + 1 = 0, would seem to suggest your statement cannot be a theorem. Mar 21 comment Is there such a thing as proof by example (not counter example) As a teacher of mine once said: beware Merten's Conjecture! en.wikipedia.org/wiki/Mertens_conjecture Mar 7 comment What was the first bit of mathematics that made you realize that math is beautiful? (For children's book) Or, more generally, that the ultimate result of this digital summing is the same as the remainder when dividing by 9.