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Jan
6
awarded  Nice Question
Nov
19
answered Are there any limit questions which are easier to solve using methods other than l'Hopital's Rule?
Nov
19
comment Are there any limit questions which are easier to solve using methods other than l'Hopital's Rule?
It probably goes without saying that it's a poor choice for expressions that aren't in an indeterminate form ($\frac{0}{0}$, $\frac{\infty}{\infty}$, $0\cdot \infty$, $0^0$, etc.).
Nov
19
comment Are there any limit questions which are easier to solve using methods other than l'Hopital's Rule?
$$\lim_{x\to \infty}\frac{2^x}{3^x}$$ is even simpler.
Nov
14
comment Determine Fastest 3 horses out of 125 when only 5 racing track are given without using stopwatch?
How do you know one of the top 3 horses didn't come in second in one of the 25 races?
Nov
14
comment Proof that if $x,z > 0,\ x+z < 1,\ (1+x)\times (1+z) \leq \frac{1}{(1-(x+z))}$
I'm guessing $z=y$.
Nov
5
awarded  Good Question
Oct
20
comment Is there an algorithm for deciding big/little-O queries?
Why $\log^{0.999}n$?
Oct
20
comment When solving for eigenvector, when do you have to check every equation?
I don't think it makes sense to say "not all the equations in (3) are linearly independent". Linear independence is a property of a whole set, not of the elements of a set. It would be clearer to say "the equations in (3) are linearly dependent".
Oct
20
comment Clarification to: A finite group that has at most one subgroup of any size is cyclic
Perhaps prove the contrapositive.
Sep
23
comment Symbol for “probably equal to” (barring pathology)?
Put the equals in quotes and then pronounce it with finger quotes.
Sep
20
revised How do you explain that in $y=x^2$, y is proportional to the square of x?
edited body
Sep
20
comment If $ab = y^2$ and $\gcd(a,b) = 1$ then show that a is either a square or the negative of a square.
Think about prime factorizations.
Sep
16
awarded  Notable Question
Sep
14
comment Why is Lebesgue so often spelled “Lebesque”?
It doesn't help that another famous French mathematician, l'Hôpital, has multiple spelling variants of his name.
Sep
7
comment Can infinity be a supremum? Can it be a maximum?
If you make this more rigorous, it's effectively the way of defining infinity.
Sep
7
comment Conditional probability with sympy
Can you link to the SO question?
Sep
7
comment Solve $f(x)f(y)=2f(x+yf(x))$
I also agree that the infectivity argument is unclear.
Sep
3
revised How do I find the exact value of $\cos^2\left(\frac{5\pi}{12}\right)$?
fix the identity
Aug
24
revised Are these two optimization problems equivalent to each other?
make the 1 vector a little easier to read