Zsbán Ambrus
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Registered User
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I'm a mathematician currently working in informatics, and at the same time a grad student researching graph theory.
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May 5 |
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roots of polynomial with matrix coefficients Is A and X the same? |
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May 3 |
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Decidability of equality of expressions built using 1,+,-,*,/,^ I believe there is such an algorithm but it's quite complicated. |
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Apr 25 |
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Does Physics need non-analytic smooth functions? You should ask this question on physics.stackexchange.com instead of here. (Btw, does "in nature" mean you don't examine physicists in carefully conducted laboratory experiments like xkcd.com/669 ?) |
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Apr 23 |
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Can a nowhere continuous function be integrable ? Ah right, Cantor set. Sorry. Ignore what I said then, and take what Loïc Teyssier says. |
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Apr 22 |
accepted | Can a nowhere continuous function be integrable ? |
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Apr 22 |
answered | Can a nowhere continuous function be integrable ? |
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Apr 22 |
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Can a nowhere continuous function be integrable ? @Hentry Wen: Henr.L is right, that function is everywhere discontinuous, because it takes the value 0 and 1 in every interval. |
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Apr 15 |
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The average number of people that can sit on a bench of a given length. Keyword to search for: online bin packing, next fit. |
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Apr 14 |
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Old books still used added 48 characters in body |
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Apr 13 |
awarded | ● Yearling |
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Apr 10 |
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The shortest mathematical paper @Martin Brandenburg: instead of your first link, do you mean mathoverflow.net/questions/7330/… ? |
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Apr 10 |
answered | The shortest mathematical paper |
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Apr 4 |
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Checkmate in $\omega$ moves? Nice! This solution actually seems more easy to understand than the others. |
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Mar 28 |
revised |
Visualizing polyhedra from their 1-skeletons references again |
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Mar 28 |
answered | Visualizing polyhedra from their 1-skeletons |
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Mar 20 |
awarded | ● Citizen Patrol |
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Mar 19 |
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“Mathematics talk” for five year olds I agree with Douglas Zare. For example, even as an adult, I can't make a convincing drawing of Pappus's theorem (Pascal's theorem applied on two lines used a degenerate conic) come out right if drawn with a straightedge. |
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Mar 10 |
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When has pure mathematics been influenced by the social context of mathematicians? Does the death of Archimedes count? The social context has caused his death, and you can find exaggerated claims about how much he could have advanced mathematics and science and engineering if he lived longer. |
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Feb 24 |
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Awfully sophisticated proof for simple facts Could you derive this result from supposing Goldbach's conjecture? |
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Feb 24 |
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Awfully sophisticated proof for simple facts Note that Michael Greinecker has also mentioned Baryshnikov's proof in an earlier reply. |
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Feb 22 |
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Is integer GCD in NC? See cstheory.stackexchange.com/questions/2708/… |
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Jan 28 |
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Diophantine equation solutions Could you change the title to something more specific, such as "Difference of two complete powers"? |
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Jan 25 |
accepted | Graphs with circulant distance matrices |
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Jan 25 |
answered | Graphs with circulant distance matrices |
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Jan 18 |
answered | Majority vote of total orders |
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Jan 15 |
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How should one present curl and divergence in an undergraduate multivariable calculus class? Have you tried to start with the two-dimensional analogs first? Once the students understand the theorems in two dimensions (both the differential and the integral forms), you can motivate curl by saying that it's what makes it possible to have analogous theorems in three dimensions. |
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Jan 14 |
revised |
Proving a determinant = 0 edited formulas in proof using (D), for I've made a mistake previously. |
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Jan 13 |
answered | Proving a determinant = 0 |
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Jan 9 |
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computational complexity I see. This likely works, though I admit I couldn't tell how to prove that the complex can't accidentally contain a sphere. Interesting. |
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Jan 9 |
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computational complexity In your construction, wouldn't two discs filling the same hole form a 2-sphere already? |
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Jan 7 |
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Are All Irrational Elementary Numbers Conjectured to Be Normal? Are floors allowed in the equation? If so, you can likely construct a non-normal number with techniques similar to how the logicians prove first-order statements quantified on natural numbers with just addition and multiplication can encode anything. If not, I still think it's likely you can do something similar. |
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Jan 2 |
answered | Old books still used |
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Dec 27 |
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Why is a ring called a “ring”? See also jeff560.tripod.com/r.html |
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Dec 25 |
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Smallest sphere intersecting lines in R^3 Wait what? The maximum of convex functions needn't be convex. For example, in one dimension, $ max(x, -x) $ is not convex despite that $ x $ and $ -x $ both are. |
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Dec 17 |
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What is the simplest known arithmetic definition of exponentiation? Juat to clarify, the quantifiers are on variables over natural numbers, and the quantifier-free formula can contain equality, addition and multiplication of natural numbers, right? |
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Dec 1 |
awarded | ● Necromancer |
