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| bio | website | kutulu.org |
|---|---|---|
| location | Florida | |
| age | 37 | |
| visits | member for | 1 year, 2 months |
| seen | Jun 14 at 14:48 | |
| stats | profile views | 17 |
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Jun 11 |
comment |
My sister absolutely refuses to learn math The most important part of your entire answer, IMO, was that the OP needs to show some willingness to help with her immediate needs, or she will just stop asking for help. |
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Jun 11 |
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My sister absolutely refuses to learn math @JoelReyesNoche if I could +10000 this answer I would. |
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May 26 |
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Does half-life mean something can never completely decay? @DanZimm He's actually asking about the pharmacological half-life, which is slightly different from the nuclear half-life. In particular, it's far less regular and predictable :) |
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May 21 |
awarded | Commentator |
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May 21 |
comment |
What is a proof? @dkbose The only thing that really stops you from doing that on an exam is that your professor will probably fail you :) I took an MIT OCW course on discrete math where the professor said basically that: "You can use any basic rules of math that you already knew coming into this course as an axiom in your proofs, as long as you don't claim to 'already know' everything we're asking you to prove." :) |
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Mar 31 |
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What does the notation $f\colon A\to B$ mean? I had the same question, though to me the meaning was pretty obvious from context I cannot figure out which "pre-req" class I should have learned this notation in. I did up through multi-dimensional calculus in college without ever seeing it, but when I started a discrete math course online it was taken for granted. |
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Aug 29 |
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Why does the logarithm require a special notation? @MJD +1 for the examples; I think an explicit mention of the fact that there are actually several "special notations" for logarithms is right on-topic for this question and would make a good addition to your answer. |
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Jul 5 |
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why have we chosen our number system to be decimal (base 10) @Jens you're pretty much right on; Europes use of place-valued base-10 numbers comes from the Arabic numbers, which were introduced by The Pope in ~1000AD. You don't get a bigger stick in Middle Ages Europe than the Church. (It also made accounting easier, which was why powerful people tended to like them and teach their kids how to use them) |
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Jun 24 |
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Why doesn't the indirect proof of irrational roots apply to rational roots? (of course I meant "rational roots") |
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Jun 24 |
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Why doesn't the indirect proof of irrational roots apply to rational roots? Ah. So for example, we know that $\sqrt{2}$ is not an integer because it must be 1 < x < 2, so we can use this proof to further prove that it cannot be rational either. |
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Jun 23 |
awarded | Scholar |
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Jun 23 |
accepted | Why doesn't the indirect proof of irrational roots apply to rational roots? |
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Jun 23 |
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Why doesn't the indirect proof of irrational roots apply to rational roots? +1 because that was actually another question I had -- is it true that all rational squares of integers are themselves integers. |
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Jun 23 |
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Why doesn't the indirect proof of irrational roots apply to rational roots? hm. so that part of the proof is true iff x is not a perfect square; isn't that just begging the question then? Aren't we trying to prove that x is not a perfect square? |
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Jun 23 |
awarded | Student |
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Jun 23 |
asked | Why doesn't the indirect proof of irrational roots apply to rational roots? |
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Jun 10 |
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Michael Spivak in “Calculus” asserts that $\sqrt2$ cannot be proven to exist, and that such a proof is impossible. What does he mean by “exist”? Regarding your question "How do you prove that a number 'exists'", you may enjoy this Numberphile video on that very topic: youtu.be/1EGDCh75SpQ |
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Apr 24 |
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Direct Proof that $1 + 3 + 5 + \cdots+ (2n - 1) = n\cdot n$ cuz its easy and people get to name-drop Gauss? who knows. |
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Apr 17 |
awarded | Supporter |
