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1d
awarded  Constituent
2d
accepted Is the Fourier series a “linear transform”?
Dec
18
asked Is the Fourier series a “linear transform”?
Dec
16
reviewed Approve Solve $x''(t)-\frac{x^2(t)}{\sin t}=\frac{\sin\left( (t-1)^2\right)}{\sin t}$.
Dec
16
comment Solve $x''(t)-\frac{x^2(t)}{\sin t}=\frac{\sin\left( (t-1)^2\right)}{\sin t}$.
Yes, excuse me. I did not think they could be important.
Dec
16
revised Solve $x''(t)-\frac{x^2(t)}{\sin t}=\frac{\sin\left( (t-1)^2\right)}{\sin t}$.
added 16 characters in body
Dec
16
comment Solve $x''(t)-\frac{x^2(t)}{\sin t}=\frac{\sin\left( (t-1)^2\right)}{\sin t}$.
I've edited my question. Thanks.
Dec
16
revised Solve $x''(t)-\frac{x^2(t)}{\sin t}=\frac{\sin\left( (t-1)^2\right)}{\sin t}$.
added 13 characters in body
Dec
16
asked Solve $x''(t)-\frac{x^2(t)}{\sin t}=\frac{\sin\left( (t-1)^2\right)}{\sin t}$.
Dec
14
accepted Definition of $L^2[-\pi,\pi]$ norm.
Dec
14
reviewed Approve Definition of $L^2[-\pi,\pi]$ norm.
Dec
14
comment Definition of $L^2[-\pi,\pi]$ norm.
Then for example, if I calculate $||(x-a)^k||_{L^2[-\pi,\pi]}$, I obtain $\sqrt{\frac{(\pi-a)^{2k+1}+(\pi+a)^{2k+1}}{2\pi(2k+1)}}$?
Dec
14
asked Definition of $L^2[-\pi,\pi]$ norm.
Dec
14
accepted Solving $y'(x)\left(4-3y(x)x^2\right)=4x$.
Dec
13
asked Solving $y'(x)\left(4-3y(x)x^2\right)=4x$.
Dec
13
accepted Calculate $\sum_{j=0}^k\binom {2k+1}{2j+1}^2=?$
Dec
11
asked Calculate $\sum_{j=0}^k\binom {2k+1}{2j+1}^2=?$
Dec
11
accepted Solve differential equation $y'''(t)=y(t) y'(t)$.
Dec
10
comment Solve differential equation $y'''(t)=y(t) y'(t)$.
excuse me! I've edited the post.
Dec
10
revised Solve differential equation $y'''(t)=y(t) y'(t)$.
edited body