997 reputation
1615
bio website vivatropolis.org/istvan
location Cambridge, United States
age 16
visits member for 2 years, 1 month
seen 4 hours ago

hacking around


Jun
26
awarded  Custodian
Jun
12
comment Mathematical research of Pokémon
@JairTaylor right- that paper uses some clever Pokémon-engineering to ensure the outcome of each battle beforehand, so it doesn't really go into this :)
Jun
2
awarded  Yearling
May
31
comment Are problems about finding the next term of a sequence mathematical?
"I find succeeding numbers of a sequence mathematical; I understand equations, both the simple and quadratical..." (I initially mis-parsed the title, with "mathematical" modifying "sequence" :)
May
27
reviewed No Action Needed Limit of $\frac{\sin(xy^2)}{x^2+y^2}$ as $x\to0$ and $y\to0$
May
25
comment Is this computation erroneous?
@franklin 100 $\neq \infty$
May
21
revised Write a second order differential equation for which y(t)= 2 cost- t is a solution and verify
improve grammar; TeXify
May
21
reviewed No Action Needed How do I find $f(4)$ when $f(n)= f(n-1)+ 2n$?
May
21
reviewed No Action Needed harmonic function invariant under a rotation
May
21
reviewed Reviewed Write a second order differential equation for which y(t)= 2 cost- t is a solution and verify
May
21
suggested suggested edit on Write a second order differential equation for which y(t)= 2 cost- t is a solution and verify
May
17
comment Limit of the absolute value of a function
Well, $\lim_{x \rightarrow c} |f(x)| = L$ implies that if $\lim_{x \rightarrow c} f(x)$ exists, it is either $L$ or $-L$, no?
May
13
reviewed No Action Needed AP Calc AB question
May
13
comment Why is cos(90)=0.4 in WebGL?
@Starkers That's correct, though it's usually more natural to think of it as having a radius of 1 rather than a diameter of 2; for this reason, it's called a "unit circle".
May
13
comment Why is cos(90)=0.4 in WebGL?
It's a well-researched question, with a problem that many might have, with an answer that isn't trivial if you didn't instantly recognize it. +1
May
3
awarded  Enthusiast
May
1
comment When would I NOT use a double implication when proving equalities between sets?
@AsafKaragila Apologies; I honestly didn't realize that there existed different conventions. Thank you for educating me!
May
1
revised When would I NOT use a double implication when proving equalities between sets?
changed proper subsets to subset-or-equals
May
1
suggested suggested edit on When would I NOT use a double implication when proving equalities between sets?
May
1
awarded  Citizen Patrol