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visits member for 2 years, 10 months
seen Nov 9 at 4:46

Sep
30
awarded  Explainer
Sep
19
answered Differentiate Piecewise Functions
Sep
3
answered How do I simplify $\arccos(x)−\arcsin(x)$ for $x$ in $(−1,1)$
Sep
3
answered Evaluate the sum
Aug
26
answered Analysis of convergence of $\sum \frac{1}{\log^a n}$
Aug
21
answered Lower bound on $F$ under the assumption $\theta F(s)\le sF'(s)$
Aug
20
comment Why is $ A_1 x + … + A_n x^n $ a solution of $ \sum_0^{n} (-1)^n \frac{x^n}{n!} \frac{d^n y}{d x^n} = 0 $?
Your differential equation should read as follows: $$\sum_{k=0}^n(-1)^k\frac{x^{k-1}}{k!}\frac{d^ky}{dx^k}=0.$$ Notice that the power on $x$ is $k-1$, not $k$.
Aug
15
answered Determining if a recursively defined sequence converges and finding its limit
Aug
14
comment In a normed vector space, does $x+r\Gamma = x'+r'\Gamma$ imply $x=x',r=r'$?
@goblin Use the definition $f^n=f^{n-1}\circ f$ for $n\ge 2$, and $f^1=f$.
Aug
10
revised In a normed vector space, does $x+r\Gamma = x'+r'\Gamma$ imply $x=x',r=r'$?
added 518 characters in body
Aug
9
revised In a normed vector space, does $x+r\Gamma = x'+r'\Gamma$ imply $x=x',r=r'$?
deleted 102 characters in body
Aug
9
revised In a normed vector space, does $x+r\Gamma = x'+r'\Gamma$ imply $x=x',r=r'$?
added 106 characters in body
Aug
9
comment In a normed vector space, does $x+r\Gamma = x'+r'\Gamma$ imply $x=x',r=r'$?
@goblin It was a mistake. I fixed it.
Aug
9
revised In a normed vector space, does $x+r\Gamma = x'+r'\Gamma$ imply $x=x',r=r'$?
added 106 characters in body
Aug
9
answered In a normed vector space, does $x+r\Gamma = x'+r'\Gamma$ imply $x=x',r=r'$?
Jul
30
answered Proof for complex numbers and square root
Jul
21
comment How to evaluate $\sum_{n=1}^{38}\sin\left(\frac{n^8\pi}{38}\right)$
@AymanHourieh what do you mean by power reduction? you should notice that the power is inside not on the sin!
Jul
11
revised Find the differential of the function at the indicated number
added 16 characters in body
Jun
20
revised Find $\alpha,\beta,K$ $\frac{a_{n+1}+\alpha}{a_{n+1}+\beta}=K \left(\frac{a_{n}+\alpha}{a_{n}+\beta}\right) $
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Jun
9
revised If $G = HN$, $N\unlhd G$, $H\cap N = 1$ - is $G/N \cong H$?
added 6 characters in body