Reputation
12,152
Top tag
Next privilege 15,000 Rep.
Protect questions
Badges
1 9 26
Newest
 Excavator
Impact
~125k people reached

Jan
30
awarded  Excavator
Jan
30
revised How to find the eccentricity of this conic?
added 7 characters in body
Jan
20
awarded  Yearling
Jan
7
answered Evaluating - $\int_{|z| =R,R > 0} z^2 \big( \sin\big(\frac{1}{z}\big) + \sin\big(\frac{2}{z}\big) + …+ \sin\big(\frac{n}{z}\big) \big) dz $
Jan
4
answered Solving $e^{iz} = 1$
Dec
29
answered Simple limit of two functions
Nov
26
awarded  Nice Answer
Nov
11
comment Prove the following equation
NO! there is no typo. Try to list all the numbers of the form $2k-1$ for $k=1,2,3,\ldots$, and all those of the form $2k+1$ for $k=0,1,2,\ldots$
Nov
10
revised Find and prove the limit of $X_n=$ $\frac {n^{100}}{1.01^n}$
deleted 9 characters in body
Nov
10
comment Prove the following equation
It is $2k-1$ if you go from $k=1$ to $\infty$, but it is $2k+1$ if you go from $k=1$ to $\infty$.
Nov
10
answered Prove the following equation
Nov
10
revised Prove the following equation
added 18 characters in body
Nov
3
answered How to compute $\int_0^{+\infty} \frac{dt}{1+t^4} = \frac{\pi}{2\sqrt 2}.$
Oct
24
revised How do you prove that $tr(B^{T} A )$ is a inner product?
added 2 characters in body
Oct
21
answered Find and prove the limit of $X_n=$ $\frac {n^{100}}{1.01^n}$
Oct
19
revised Express ∑sin(kx)/k as the sum of a function and the integral of another function
added 120 characters in body
Oct
18
answered Show that $f(x,y)$ is differentiable at $(0,0)$
Oct
18
comment Show that $f(x,y)$ is differentiable at $(0,0)$
If $f(0,0)=0$, then $df(0)\equiv0$ because $|f(h)|\le \|h\|_2^3$ for all $h \in \mathbb{R}^2$
Oct
18
comment Show that $f(x,y)$ is differentiable at $(0,0)$
The title and the problem do not match. Your title says that "show that $f$ is differentiable at $(0,0)$", however you haven't specified the value of $f(0,0)$. In fact, if $f(0,0) \ne 0$, then $f$ is not even continuous at $(0,0)$ and can not be differentiable at $(0,0)$.
Oct
16
answered Find the limit of $(1+\frac{1}{n})^{n^2}/e^n$ without using derivatives