608 reputation
313
bio website
location
age
visits member for 3 years, 10 months
seen yesterday

Aug
26
asked Precedence of concatenation: Is $5/7y$ equal to $(5/7)\times y$ or $5/(7\times y)$?
Aug
9
comment Gödel says: countable proofs, uncountable conjectures?
I really like this answer, but is it really that simple? You can construct the statement "this statement is false" in any axiom system with arithmetic? Seems too easy?
Aug
9
asked Gödel says: countable proofs, uncountable conjectures?
Aug
9
asked Estimate Stirling numbers from normal distribution?
Jul
9
answered Big List of Fun Math Books
Jun
10
comment Michael Spivak in “Calculus” asserts that $\sqrt2$ cannot be proven to exist, and that such a proof is impossible. What does he mean by “exist”?
It annoys me that the phrases "least upper bound", "greatest lower bound", lub, and glb do not appear in this post, so I am adding them now <G>
Oct
13
awarded  Yearling
Oct
11
comment Can we say (for sure) that "the function is increasing” to mean that the first derivative is positive?
Increasing functions don't even have to be continuous!
Oct
11
comment Find the limit of a function
As a note, you can use "view source" to see other people's TeX, even for posts where you don't have the 'edit' privilege.
Oct
1
comment Formula for likely prime
g(n) = nth prime number works :) [as Andre' notes below]. Could you limit your definition of "formula"?
Oct
1
answered Trigonometric identity proof
Sep
4
comment Did Galois show $5^\sqrt{2}$ can't solve a high-order integer polynomial?
This is fantastic, thank you!
Sep
4
accepted Did Galois show $5^\sqrt{2}$ can't solve a high-order integer polynomial?
Sep
3
comment tough integral involving $\sin(x^2)$ and $\sinh^2 (x)$
If it's any consolation, Mathematica can't solve "Integrate[Sin[Pi*x^2]/Sinh[Pi*x]^2, {x,0,Infinity}]", which means it's not easy.
Sep
3
asked Did Galois show $5^\sqrt{2}$ can't solve a high-order integer polynomial?
Aug
29
comment $2 \lfloor x \rfloor \leq \lfloor 2x \rfloor \leq 2 \lfloor x \rfloor +1$
Floor(x) = x - frac(x) may help.
Aug
29
answered Approximation to $ \sqrt{2}$
Jul
9
comment p chance of winning tennis point -> what f(p) chance of winning game?
@Frederick I'm not understanding your comment?
Jun
11
comment p chance of winning tennis point -> what f(p) chance of winning game?
I was initially unsure of your answer, since it seemed really complex. However, if you're at deuce, the win chance is "Simplify[Solve[x == p^2 + 2*p*q*x, x] /. q -> 1-p]", and Mathematica confirms that doesn't simplify much. As a note, your numerator simplifies to (-3 + 2 p) (5 - 8 p + 4 p )^2, but this doesn't really any value to the answer.
Jun
11
accepted p chance of winning tennis point -> what f(p) chance of winning game?