cobaltduck
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 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 10 awarded Quorum Sep 2 awarded Critic 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? May 23 answered Algebra: What allows us to do the same thing to both sides of an equation? 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 Oct 5 comment Why does my calculator show $2^{-329} = 0?$ Reminds me of this oldie but goodie: cs.bgu.ac.il/~omri/Humor/lightbulb.html (first item). 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.