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Mar
30
comment Residue theorem application [demonstration]
does it specify what kind of pole? where? is this its sole pole?
Feb
11
comment How to determine linear dependent?
$i+2j-(i+3j)+j=0$ so they're linearly dependent
Feb
3
awarded  Enthusiast
Feb
2
comment How does $\arctan\sqrt{f_x^2 + f_y^2}$ result in the slope?
what you have is equivalent to $\tan\phi=|\nabla f|$, but this formula does not encode 'slope' so much as it does a skewed measure of how quickly $f$ varies at some point
Feb
1
revised A level Integration: $\int\frac{x^3}{\sqrt{x^2-1}}dx$
added 44 characters in body
Feb
1
answered Geometric Interpretation of S3
Jan
31
answered Convergence of a complex series
Jan
31
answered Evaluating $\lim_{x\rightarrow\pi}\frac{\sin x}{x^2-\pi ^2}$ without L'Hopital
Jan
30
revised $\omega_f (x) = 0 $ iff f is continuous at $x$
added 20 characters in body
Jan
30
answered $\omega_f (x) = 0 $ iff f is continuous at $x$
Jan
30
revised $\omega_f (x) = 0 $ iff f is continuous at $x$
added 18 characters in body; edited title
Jan
30
comment $\omega_f (x) = 0 $ iff f is continuous at $x$
en.wikipedia.org/wiki/Mathematics_of_oscillation
Jan
30
comment Determine the kernel of a linear map $f:U \to V$
oops, I tagged the wrong person -- sorry
Jan
30
revised Finding the unit normal vector
edited tags
Jan
30
comment Finding the unit normal vector
$2+e^{12t}+e^{-12t}=e^{-12t}((e^{12t})^2+2e^{12t}+1)=e^{-12t}(e^{12t}+1)^2$
Jan
30
answered Determine the kernel of a linear map $f:U \to V$
Jan
30
comment Determine the kernel of a linear map $f:U \to V$
@Bernard if $f$ maps the generators of $U$ to scalar multiples of $v_1+v_2$ then it follows that $v_1+v_2$ alone generates $\operatorname{Im}(f)$
Jan
30
answered What's the name of this law in Boolean algebra?
Jan
29
asked Redundancy in the Laplace transform and Mellin's inverse formula
Jan
29
comment Connection between the Laplace transform and generating functions
moments of $f$ not $t$, sorry