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| bio | website | |
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| location | ||
| age | ||
| visits | member for | 1 year, 1 month |
| seen | 21 hours ago | |
| stats | profile views | 231 |
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Nov 30 |
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$f: V \mapsto V$ is a projection, show $V = \ker(\pi) \oplus \operatorname{Im}(\pi)$ What do you mean by $\ker(\pi)+im(\pi)$? Do you mean $\ker(\pi)\oplus im(\pi)$? In that case, equivalence is not clear to me. |
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Nov 30 |
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$f: V \mapsto V$ is a projection, show $V = \ker(\pi) \oplus \operatorname{Im}(\pi)$ A rather quick method would be using the exact sequence $0\to\ker f\to V\to V/\ker f\to0$. |
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Nov 30 |
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$f: V \mapsto V$ is a projection, show $V = \ker(\pi) \oplus \operatorname{Im}(\pi)$ "So v = (v - π(v)) + π(v) is in Ker(π) + Im(π)." Please explain. |
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Nov 29 |
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Convergence on open-minus-countable topology What have you tried? |
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Nov 29 |
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how to calculate the fundamental group using intitutive ideas? @hina: what is unclear. |
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Nov 29 |
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how to calculate the fundamental group using intitutive ideas? @QiaochuYuan: I don't think so. isn't the fundamental group of what you're saying isomorphic to Z? I don't think hina's group is... |
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Nov 27 |
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How can I find this result modulo $10^8$? if $N$ is much smaller than $a$, your square root is approximately equal to just $2a+1$. |
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Nov 27 |
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Solve $x^2(1-x) = 1$ There is only one real solution, there are two complex solutions. See wolframalpha.com/input/?i=solve+x%5E2%281%E2%88%92x%29%3D1 |
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Nov 27 |
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How to Integrate along a path Trying to save one more unupvoted answer from doom. |
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Nov 27 |
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proving homeomorphism This answer is correct, but of course the formula you gave is not very helpful - I mean sure, it is right, but how'd you get it? Surely you can shed some light on that. |
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Nov 27 |
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$R\neq R[x]$ if $R$ be Noether ring You clearly did not learn from the comments to your previous questions. Please add your own work and attempts, and don't use the imperative "show". |
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Nov 24 |
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Is mathematics the only language that is not subject of interpretation? @tomasz: ugh, no, the language of mathematics is not explained in every single paper or a mathematical subject. but that is of course not the point that I was trying to make :-/ |
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Nov 23 |
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Limit of sequences @yuta, well, do you have a definition for convergence? What have you tried to prove the statements? |
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Nov 23 |
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Is mathematics the only language that is not subject of interpretation? If you're looking for largely unambiguous languages, take a look at lojban. Mathematics is ambiguous, but usually clear by context. |
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Nov 23 |
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Is mathematics the only language that is not subject of interpretation? deleted 1 characters in body |
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Nov 23 |
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Is mathematics the only language that is not subject of interpretation? @Derfder: please, don't think you understand string theory if you don't even get the uncertainty principle. |
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Nov 23 |
revised |
Is mathematics the only language that is not subject of interpretation? deleted 1 characters in body |
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Nov 23 |
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Is mathematics the only language that is not subject of interpretation? @Derfder: i don't really get your comment, what are you trying to say? |
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Nov 23 |
answered | Is mathematics the only language that is not subject of interpretation? |
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Nov 23 |
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Not understanding modulo i agree with that very first equation, but for a non-mathematician it might seem unnatural, and of course it is of huge importance in ring theory so some explanation could be useful |
