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bio website linkedin.com/in/gt6989b
location New York, NY
age 35
visits member for 3 years
seen Sep 8 at 20:22

Sep
16
awarded  Yearling
Aug
31
comment 2 examples to try to understand partials derivatives and deriviability
A discontinuous function is not differentiable. In any number of dimensions. You can design a continuous variant that would be differentiable, but that would not be the function itself.
Aug
28
answered 2 examples to try to understand partials derivatives and deriviability
Aug
28
comment Omega Notation and Average Running Time Problem
@MounaMokhiab think about how you compute average-case running time for an algorithm. you compute what it's performance is on a set of all possible inputs and take the average. when you take the average, it may do bad on a very small section of inputs but do ok on the rest - since you are averaging over a very large quantity - it will take out any factor of your choice. Randomization was just a simplest way to give an example of this.
Aug
28
comment There is no nonconstant entire function $f$ such that $f(z+1)=f(z)$ and $f(z+i)=f(z)$
Makes sense to me
Aug
28
comment Omega Notation and Average Running Time Problem
@MounaMokhiab yes, same method as Snufsan described in the above comment: toss $f(n)$ coins if all heads, waste $n^n$ time and do something in $n^2$, else do something in $n^2$. Total running time is $2^{-f(n)} n^n + (1-2^{-f(n)}) n^2$ and now if $f(n)$ is large enough you are good to go.
Aug
28
answered Omega Notation and Average Running Time Problem
Aug
28
comment Is$\frac{\sqrt{a}}{\sqrt{b}}$ the same as $\sqrt{\frac{a}{b}}$?
Yes, they are different, but where both are defined (i.e. on the intersection of domains) - the values will coincide.
Jul
21
answered what is difference between numerical integration and interpolation?
May
14
comment Find the distribution of $X_1^2 + X_2^2$?
@user111548 Yes.
May
14
comment Find the distribution of $X_1^2 + X_2^2$?
@user111548 no. I meant that the mgf of $X$ and mgf of $X/\sigma$ are not the same thing.
May
14
answered Find the distribution of $X_1^2 + X_2^2$?
May
5
comment Proving breath first traversal on graphs
@DrJonesYu Think about what $\textrm{Next}$ is at iteration $k$ -- this is a set of all vertices $x \in V$, such that for some $u \in V$, which is $k-1$ steps from $r$, there is an edge $(u,x)$. But that means $x$ is in the connected component of $r$.
May
5
comment Conditional CDF
@Someone i think so, made the edit
May
5
revised Conditional CDF
added 202 characters in body
May
5
comment How prove this $ n = \frac {a^3 + 2b^3} {c^3 + 2d^3}. $ infinitely many special numbers
For (2), from your equation follows that $a^3$ is even, so $a$ is even, so $a = 2A$ and the equation becomes $$4A^3 + b^3 = 19 \cdot 53 (c^3 + 2d^3),$$ and $b$ and $c$ must have the same parity.
May
5
answered How to prove that the following function is convex?
May
5
revised Calculate Interest
added 11 characters in body; edited tags
May
5
answered Conditional CDF
May
5
answered Confused about isolating an argument from a fraction and computing a value for it