494 reputation
27
bio website
location Utrecht, Netherlands
age
visits member for 2 years, 9 months
seen Nov 19 at 22:12

Sep
26
revised Sampling from Cartesian product without replacement, but with balanced totals
Added alternative formulation
Sep
26
revised Sampling from Cartesian product without replacement, but with balanced totals
Added alternative formulation
Sep
26
revised Sampling from Cartesian product without replacement, but with balanced totals
edited tags
Sep
25
revised Sampling from Cartesian product without replacement, but with balanced totals
edited body
Sep
25
awarded  Student
Sep
25
comment Identification of matrix index notation
I'm guessing the star is there in order to visually separate $a_i$, the array for a particular chemical element, from the indices $j$ and $k$? But this still doesn't explain the parentheses on $(j)$, so who knows...
Sep
25
revised Sampling from Cartesian product without replacement, but with balanced totals
added 113 characters in body
Sep
25
asked Sampling from Cartesian product without replacement, but with balanced totals
Mar
31
revised Continuous function $f:\mathbb{R}\to\mathbb{R}$ such that $f(f(x)) = -x$?
added 155 characters in body
Mar
31
revised Continuous function $f:\mathbb{R}\to\mathbb{R}$ such that $f(f(x)) = -x$?
added 105 characters in body
Mar
18
revised Is $\{x\}$ an element of $\{x,\{x,y\}\}$ or not?
added 133 characters in body
Mar
18
answered Is $\{x\}$ an element of $\{x,\{x,y\}\}$ or not?
Feb
26
awarded  Yearling
Feb
2
comment Coin flipping probability game ; 7 flips vs 8 flips
I'm surprised you think they're the same. "ties are discounted" changes the rules too much for my comfort, what can I say. JimmyHe's answer is very different: At a higher level, and more elegant, I must say-- but only if the core assertions are demonstrated, and I'm among those who don't find them self-evident.
Feb
2
comment Coin flipping probability game ; 7 flips vs 8 flips
@Did, which one do you mean? If I'm not adding anything new, I'll delete my answer. Many answers consider the point after 7+7-tosses, but I didn't spot any that are complete in both dividing into cases properly, and in discussing what the final toss can and cannot do.
Feb
1
answered Coin flipping probability game ; 7 flips vs 8 flips
Jan
21
answered What is the difference between a point and a vector
Jan
13
comment How to prove that a $3\times 3$ Magic Square must have $5$ in its middle cell?
Oh, by the problem statement you mean... got it.
Jan
13
comment How to prove that a $3\times 3$ Magic Square must have $5$ in its middle cell?
How so for the diagonal sums?
Jan
10
comment Why is Euclid's proof on the infinitude of primes considered a proof?
@Michael, that's exactly what I understand too. What I'm asking is why you agreed with Marc's statement that Euclid's argument "fails by our standards".