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7h
comment Limits in multivariable functions
You don't solve a limit, but you evaluate or compute it.
1d
answered Determine $P(x)$, with real coefficients and the lowest possible grade, such that $0$, $1+i$ and $1-i$ are its roots and $P(-2)=1.$
2d
revised Prove a certain function is discontinuity type I and integrable.
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Jun
21
answered Let $B=\{ (x,y,z) \in \mathbb R^3 : x^2 + y^2 + z^2 \le 1\}$. Prove existence of a unique point $v_0 \in B$ that is closest to $v \notin B$?
Jun
15
awarded  Enlightened
Jun
15
awarded  Nice Answer
Jun
14
answered How to prove that $\cos^2(z)+\sin^2(z)=1$, where $z$ is a complex variable (if it is true)?
Jun
12
answered Evaluate the complex integral of function
Jun
10
comment Calculate the length of $\gamma(t)=(t,t), t \in [-1,-\frac{1}{2}]$ with the metric $g=\frac{dx^2+dy^2}{y^2}$ and compare with euclidean metric
For $t\in [-1,-.5]$ your $\gamma(t)$ does not belong to the upper half plane $\mathbb{R}_+^2$.
Jun
9
answered Laurent Series of $\frac{z+1}{z(z-4)^3}$ in $0<|z-4|<4$
Jun
9
revised Laurent Series of $\frac{z+1}{z(z-4)^3}$ in $0<|z-4|<4$
added 65 characters in body; edited title
Jun
8
answered Double Integrals involving infinity
Jun
8
revised Double Integrals involving infinity
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Jun
8
answered Evaluation of integral, with a reverse substitution to line integral.
Jun
6
answered confusion in using Lebiniz integral rule
Jun
5
comment Proving a sum diverges
@NotALoner Why would you assume that?
May
31
revised How do I show that if $f$ is bounded and integrable on $\mathbb{R}$, then $g(t) = \int_t^{t+1} f(x) dx$ is continuous?
added 15 characters in body
May
31
answered How do I show that if $f$ is bounded and integrable on $\mathbb{R}$, then $g(t) = \int_t^{t+1} f(x) dx$ is continuous?
May
31
revised Show that $\|Du_{\lambda}\|_{L^2(\mathbb{R}^n)} = \|Du\|_{L^2(\mathbb{R}^n)}$
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May
31
answered Show that $\|Du_{\lambda}\|_{L^2(\mathbb{R}^n)} = \|Du\|_{L^2(\mathbb{R}^n)}$