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 Aug 15 comment Determining the Wave Function From Initial Conditions Yes, exactly. As far as I understand, the most general solution of the infinite well is $\Psi (x,t) = \sum_{n=1}^{\infty} c_n \psi_n(x) \phi_n(t)$, where the coefficients are $c_n = \sqrt{\frac{2}{a}} \int_{0}^{a} \sin(\frac{n \pi}{a} x) \Psi(x,t)$. Why wouldn't I use these two equations to calculate the wavefunction for all future times? Aug 15 asked Determining the Wave Function From Initial Conditions Jul 29 accepted Finding Interatomic Spacing Jul 28 asked Finding Interatomic Spacing Jul 2 awarded Curious May 13 awarded Notable Question Mar 19 awarded Notable Question Feb 26 awarded Notable Question Feb 17 awarded Popular Question Jan 7 awarded Notable Question Jan 2 comment Collision Between Two Particles: Writing the Mass As A Function of The Angle I don't believe this is a duplicate: I am asking for advice as to how I might write $\displaystyle \frac{m_1}{m_2}$ as a function of the angle (some angle); but the other question asks to verify unrelated equations. Jan 2 comment Collision Between Two Particles: Writing the Mass As A Function of The Angle Well, I was defining $\theta$ as the angle between the final velocity vectors. Would this not be helpful? Dec 31 asked Collision Between Two Particles: Writing the Mass As A Function of The Angle Nov 27 awarded Popular Question Nov 3 awarded Yearling Oct 13 awarded Popular Question Oct 2 awarded Notable Question Sep 5 awarded Popular Question Jul 25 awarded Popular Question Jun 23 awarded Popular Question