joriki
Reputation
99/100 score
9 142 275
Impact
~2.3m people reached

# 143,071 Reputation

75 today
 +30 12 hours ago 3 events probability of sorted array with duplicate numbers +20 49 mins ago 2 events Proving $\sum_{k=1}^{n}{(-1)^{k+1} {{n}\choose{k}}\frac{1}{k}=H_n}$ +15 2 hours ago accept Data point on regression line: Effect on estimates (simple linear regression) +10 7 hours ago upvote First year calculus student: why isn't the derivative the slope of a secant line with an infinitesimally small distance separating the points?
265 yesterday
 +85 23:56 9 events Proving $\sum_{k=1}^{n}{(-1)^{k+1} {{n}\choose{k}}\frac{1}{k}=H_n}$ +25 16:49 2 events What is the probability that another event will happen? +25 11:57 2 events Expected sum of Hamming distances in set of random strings +20 08:53 2 events Axiom of Choice: Where does my argument for proving the axiom of choice fail? Help me understand why this is an axiom, and not a theorem. +15 18:00 accept Arrange 18 pips on a die with at least one 0 side to maximize the probability that 5 rolls sum to 13 or more. +15 04:40 accept Seeking Additional Solutions for the Number of Network Links +10 23:00 3 events Is there no proof of Dirichlet's results on quadratic residues without analysis? +10 22:48 upvote probability of sorted array with duplicate numbers +10 22:09 upvote How come associative law of matrix multiplication won't work when permutation matrices come in. Which is the case for some +10 12:49 upvote Expected outcome for repeated dice rolls with dice fixing +10 12:12 upvote Conditional expectation of independent variables +10 05:31 upvote Show how (0,(12)) and (1,(12)) are in different conjugacy classes. +10 01:47 upvote Did the U.S. Army use a formula to evaluate fitness performance? +10 01:45 upvote How to calculate the number of possible connected simple graphs with $n$ labelled vertices +10 00:40 upvote Why does $(128)!$ equal the product of these binomial coefficients $128! = \binom{128}{64}\binom{64}{32}^2 \dots \binom21^{64}$? -10 13:31 removed User was removed (learn more)
220 2 days ago
 +40 15:47 4 events Arrange 18 pips on a die with at least one 0 side to maximize the probability that 5 rolls sum to 13 or more. +30 14:16 3 events Axiom of Choice: Where does my argument for proving the axiom of choice fail? Help me understand why this is an axiom, and not a theorem. +30 13:40 3 events A paradox on countability. +25 14:54 2 events Choosing a Non-Confederate Volunteer +15 10:48 accept Why isn't there a need to specify a single $x$ in the axiom schema of replacement? +10 20:16 upvote Seeking Additional Solutions for the Number of Network Links +10 20:13 upvote Probability Combinatorial related; choosing couples +10 16:17 upvote Variance of the sum of correlated variables +10 12:06 upvote Continuity of a function that maps a point to the closest point on a compact convex set +10 11:59 upvote Probability of choosing $n$ numbers from $\{1, \dots, 2n\}$ so that $n$ is 3rd in size +10 11:15 upvote Number of positive unequal integer solutions of $x+y+z+w=20$ +10 10:55 upvote Number of positive integral solutions to $x+y+z+w=20$ with \$x
290 Jun 26
195 Jun 25
270 Jun 24
261 Jun 23
291 Jun 22
140 Jun 21
273 Jun 20
65 Jun 19
170 Jun 18
150 Jun 17
90 Jun 16
140 Jun 15
110 Jun 14
165 Jun 13
60 Jun 12
33 Jun 11
75 Jun 10
120 Jun 9
290 Jun 8
215 Jun 7
275 Jun 6
40 Jun 5
230 Jun 4
245 Jun 3
335 Jun 2
292 Jun 1
240 May 31