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Jan
28
reviewed No Action Needed Urn with marbles, unknown number of colors
Jan
28
reviewed Reviewed Why does notation for functions seem to be abused and ambiguous?
Jan
28
reviewed Reopen Finding Eigenvalues of given linear operator
Jan
27
reviewed Reopen Fundamental group of two circles joined by an arc
Jan
27
reviewed Leave Closed If $a^2+ab+b^2=c^2+cd+d^2$ then $a+b+c+d$ is not prime.
Jan
26
reviewed Leave Closed Can every group be extended to ring with idenity
Jan
26
comment How to show that $(L_n,F_n) < 3$ (Lucas numbers and Fibonacci numbers)
You're quite welcome! I've never been anywhere near IMSA...
Jan
26
answered How to show that $(L_n,F_n) < 3$ (Lucas numbers and Fibonacci numbers)
Jan
26
reviewed Leave Closed Number of circular permutation of word 'CIRCULAR'
Jan
26
reviewed Reopen How many critical values does $f$ have on $(0,10)$, given $f '(x)=\frac{\cos^2 x}{x} -\frac{1}{5}$?
Jan
25
comment Can the cube of every perfect number be written as the sum of three cubes?
None of $495$, $82$, and $57$ are prime.
Jan
25
reviewed Leave Closed Integers Positioned Around a Circle
Jan
24
reviewed Leave Closed Proving $1+\sum_{i=1}^n i (i!)=(n+1)!$
Jan
24
revised Algebra on a Louvre tablet
this is not algebraic geometry
Jan
24
answered Closed non-exact $2$-form on $T = S^1 \times S^1$
Jan
22
answered Show rigorously that the sum of integrals of $f$ and of its inverse is $bf(b)-af(a)$
Jan
21
reviewed Reopen How long is the shadow of a 6-foot tree planted 15 feet from a 18-foot lamp post?
Jan
21
reviewed Approve graph-laplacian tag wiki excerpt
Jan
21
reviewed Approve graph-laplacian tag wiki
Jan
20
comment Examples of open problems solved through short proof
Here is an example of this happening on MathOverflow, I think. I don't understand the details well enough to want to write up a full answer, though...