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 Dec 17 comment Compute shooting targets for the gunmen Yes, I noticed, and I apologize. While most SEs are looking for a single, canonical, correct answer, PGP prefers games where multiple players can enter, trying to score highest/lowest points and get the winning score. PGP has a king-of-the-hill tag, for example. Another commentor thought there might already be a challenge like yours under that tag. I searched but couldn't find it. Not too late to edit yours. Dec 16 comment Compute shooting targets for the gunmen I can't help but think that this would also make an excellent challenge on Programming Puzzles and Code Golf SE. Dec 2 comment How do I explain the Königsberg Bridge problem to a child? (As noted) Repeat demo for several other similar diagrams. Then ask if anyone can guess why you can draw some but not others. Aug 17 comment Why do we not have to prove definitions? A wise old professor of mine once put it this way: Definitions are the playing pieces; axioms are the rules of the game; theorems are results we can obtain by following the rules and using the playing pieces. Mar 12 comment How to explain brackets to young students +1 for being the only answer here to call this thing by its proper name: Associativity. "Fear of a name only increases fear of the thing it represents" - Dumbledore. Oct 3 comment Quick and painless definition of the set of real numbers Can you use a (fantasy-world ideal with no restrictions such as the width of a graphite molecule) pencil to draw a line x centimeters long? If yes, then x is a real number. Sep 2 comment Taking Calculus in a few days and I still don't know how to factorize quadratics First, you should be able to succeed in calculus even with some small gaps in your knowledge of algebra, so you need not be overly worried. Next, I assume you have have already spent many hours with speaking with your teacher, reading your textbook, doing your homework, possibly with friends or in a study group, looking up online resources, and maybe even trying your parents, all in an effort to learn this topic. Unfortunately, this community is not going to be able to add anything new to what you've already done. May 24 comment Algebra: What allows us to do the same thing to both sides of an equation? @symplectomorphic: I agree 100%. But if it gets a learner started and helps with the basics before moving on to more advanced topics, what's the harm? 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. 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 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. 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. 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.