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visits member for 2 years, 5 months
seen Dec 16 at 15:46

Dec
16
answered How many subgraphs of $K_{m,n}$ are there that contain m + n vertices?
Sep
30
awarded  Explainer
Sep
19
answered Function as a series :
Jul
20
awarded  Yearling
Jun
10
comment Find $\alpha$ and $\beta$ so that $f(x)$ is continuously differentiable
If $f$ is differentiable in $0$, then $f$ has to be continuous there as well!
Mar
4
comment Proof x \in L \leftrightarrow det(…) = 0.
Because you can combine the first and second row to get the third row (multiply the first by $(1-\lambda)$ and the second by $\lambda$ and add them up. For the other direction: If $\det$ is $0$ then it can easily be shown that the row vectors have to be linear dependent.
Mar
4
answered Proof x \in L \leftrightarrow det(…) = 0.
Feb
27
comment How prove this limit $\displaystyle\lim_{n\rightarrow \infty} \frac{f_n}{f_{n+1}}=a $
This is no counter example, because $|a|<|b|$ and thus $a = -b $ is not possible
Feb
19
comment Real and Imaginary Parts of $z^z$
It should be $sin(y)$ but other than that its right. Now apply all that to $z^z$ and you should be able to do it :)
Feb
19
comment Real and Imaginary Parts of $z^z$
Can you get the real and imaginary parts of $e^z$? If so you are almost finished ...
Feb
19
comment Real and Imaginary Parts of $z^z$
No, not $z$, but $z^z$. For example, how do you define $i^i$?
Feb
19
comment Real and Imaginary Parts of $z^z$
First of, how do you define $z^z$ ?
Feb
15
awarded  Civic Duty
Feb
15
answered Let $T: V \rightarrow V$ be a linear operator with $Ker(T) = \{ 0 \}$. Show that if $V$ is finite dimensional, then $T$ is surjective.
Feb
12
awarded  Enlightened
Feb
12
awarded  Nice Answer
Jan
10
answered Explanation for a exercise using the L'Hôpital's rule
Jan
10
answered Any good calculus texts in German?
Dec
26
comment Compare the two values
@DavidMitra:I think $f$ should be continuous
Dec
23
comment Convergence question
Suppose $a_1 = 1$ then the product is $0$, but the series does not need to converge