Activity for whybecause‭

Type	On...	Excerpt	Status	Date
Comment	Post #285986	That is certainly another helpful perspective, sure. (more)	—	about 2 years ago
Comment	Post #285755	It's only zero. If ax=b and a is not zero, then x=b/a. This effectively guarantees that division by a nonzero number preserves any solution, regardless of what x is (or what a and b are, again assuming a is nonzero). This comes down to the definition of division. What does 15/5 = 3 mean? It ... (more)	—	about 2 years ago
Comment	Post #285755	To my knowledge this rule does not have a name. Rather, to talk about it, we merely point out that division by zero could be a problem, so we proceed to separate the solution method into cases. Each case avoids the issue of dividing by zero. Alternately you can characterize this by the zero-pr... (more)	—	about 2 years ago
Comment	Post #285755	To answer this, it is important to remember what any of this even means. What do we mean by any equation, like x-2=3? Actually, without any context, this doesn't mean anything at all. But usually when we write "x-2=3" this is like a short-hand for a question. Namely "What are all of the value... (more)	—	about 2 years ago
Comment	Post #285755	If b=0 then you may get invalid solutions, yes. So you should divide this solution method into two cases. Case 1 is that x=5. In that case you cannot divide by x-5, but it doesn't matter, because you already know the solution. Case 2 is that x is not 5. Then you can divide by x and then the ... (more)	—	about 2 years ago
Comment	Post #285015	@#36356 I think the point you're making, which I would agree with, is that not all things *can* be made intuitive. That's right, and it's right to point that out to a student, in such cases. (more)	—	over 2 years ago
Comment	Post #285447	I suspect this question isn't stated fully enough, and also should probably be stated as a pure math problem rather than relying on any domain knowledge about ETF's. If you're minimizing overlap and want to buy as few as possible, and those are literally the only constraints ... then choose zero of ... (more)	—	over 2 years ago
Comment	Post #285436	Right, wasn't being careful, I'll edit. (more)	—	over 2 years ago
Comment	Post #285425	From glancing around, it looks to me like actually this is already a success in getting questions answered. Although my survey of the posted questions is brief, it looks to me like the success rate is pretty comparable to SE. I do think that it seems to take longer for a question to get answered, a... (more)	—	over 2 years ago
Comment	Post #285426	I agree with you "when I see this what should I think?" is a good math question. But my experience with SE and my brief experience here at Codidact, tells me that these sorts of questions get heavily downvoted and closed. So it made me wonder if it would make sense to give them their own home, so t... (more)	—	over 2 years ago
Comment	Post #285342	Mathematical induction is not scientific induction. So in that sense mathematical induction is misnamed. But ... maybe scientific induction is the one that's misnamed. I don't know the history of these terms, but in any case, someone somewhere should change at least one of these names. What c... (more)	—	over 2 years ago
Comment	Post #283900	If when you ask "How would you know to do the next step?" you have emphasis on the word "the", then I agree with your argument. There is not a unique next step, and not even a unique best next step. But if the question is mean to ask, "What am I supposed to be learning here? How am I supposed ... (more)	—	over 2 years ago
Comment	Post #284788	An opinionated answer: I love topology and hate how it's taught in just about every course and textbook I've ever encountered. For this reason, I think you appreciate topology the most after you've learned a lot of other stuff first and then can appreciate what it's talking about because you can fi... (more)	—	over 2 years ago
Comment	Post #285015	I would be weary of this sort of explanation. If you have a property which you do not find intuitive, but also not counter-intuitive, then you are ... just stuck. So I do think, if the job is to give intuition, you really need to give the intuition, and not just turn it around on the student. (more)	—	over 2 years ago
Comment	Post #285365	As a direct answer to the question, I can't say what we mean by "natural". But I can tell you that it is not well-defined or even a common "abuse of notation" (as you sometimes see even when a notation doesn't make perfect literal sense) to use two pipes inside a single probability function. Someti... (more)	—	over 2 years ago