Robert Israel
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# 207,037 Reputation

180 today
 +80 13 hours ago 8 events How to solve $f'(x)=f'(\frac{x}{2})$ +20 7 hours ago 2 events Do men or women have more brothers? +10 4 hours ago upvote In how many ways can four integers be selected from $1, 2, 3, \ldots, 35$ so that the difference of any pair of the four numbers is at least $3$? +10 4 hours ago upvote Why does volume go to zero? +10 8 hours ago upvote Roots of Sum of Two Polynomials (with Known Roots) +10 14 hours ago upvote If $f(\frac{x+y}{2})=\frac{f(x)+f(y)}{2}$, then find $f(2)$ +10 15 hours ago upvote How can I calculate OEIS A144311 efficiently? +10 17 hours ago upvote intersection of boundaries have Lebesgue measure 0 +10 17 hours ago upvote Implicit function theorem +10 20 hours ago upvote computer algorithm VS mathematical algorithm
231 yesterday
 +50 05:20 5 events summation of $\sum_{k=0}^{\infty}x^{n^{k}}$ +30 16:22 3 events Roots of Sum of Two Polynomials (with Known Roots) +30 09:40 3 events General Principles of Solving Radical Equations +25 23:27 3 events $K$ compact metric space, is there a finite set of continuous functions that separates points in $K$? +25 01:28 2 events On a certain prime structure. +20 19:04 2 events intersection of boundaries have Lebesgue measure 0 +11 22:44 2 events If $f(\frac{x+y}{2})=\frac{f(x)+f(y)}{2}$, then find $f(2)$ +10 12:35 upvote Expected rolls to get 3 of any number +10 10:01 upvote Number of ways to write $n$ as sum of $k$ non-negative integers without 1 +10 03:53 upvote How many ways are there for W women and M men to sit on N chairs, if no man can sit next to woman? +10 01:34 upvote Integral of $e^{\cos t}$ 23:36 upvote If $f\in C^1[a,b]$, then it can be expressed by the sum of an increasing function and a decreasing function. 23:20 upvote How to solve $f'(x)=f'(\frac{x}{2})$
130 2 days ago
 +30 21:43 3 events $K$ compact metric space, is there a finite set of continuous functions that separates points in $K$? +30 00:51 3 events Roots of Sum of Two Polynomials (with Known Roots) +25 18:43 2 events $\mathcal{L}^N(B_r(x)\cap E)> 0 \hspace{0.6cm} \forall r>0$ if every point is a Lebesgue Point +15 02:40 accept Explicit solution to a Rayleigh quotient equation +10 23:21 upvote What is the difference between metric spaces and vector spaces? +10 17:29 upvote Does a repeated eigenvalue always mean that there is an eigenplane under the transformation matrix? +10 13:26 upvote Help with using the Runge-Kutta 4th order method on a system of three first order ODE's.
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