anuttarasammyak's latest activity
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anuttarasammyak replied to the thread Undergrad Why is a Gaussian function used to represent a wave packet?.A Gaussian wave packet has the property that its width increases with time while its overall shape is preserved. This behavior is... -
anuttarasammyak replied to the thread Undergrad Mixed approximation vs. full approximation for a power series expansion.By the equations of post #4 $$x(0)=1-\frac{h(0)}{f(0)}=0$$ so $$(c_3+c_5)f(0)=c_1c_2$$ Is that correct ? We do not have freedom of... -
anuttarasammyak replied to the thread Undergrad Mixed approximation vs. full approximation for a power series expansion.What is your choice of constant c’s that makes divergence at t=0? -
anuttarasammyak replied to the thread Undergrad Mixed approximation vs. full approximation for a power series expansion.I do not find divergence at t=0 for ##c_3, c_5 \neq 0##. Could you explain it in detail? -
anuttarasammyak replied to the thread Undergrad Mixed approximation vs. full approximation for a power series expansion.You may carry out Taylor expansion $$ f(t) = \sum_{n=0}^\infty \frac{f^{(n)}(0)}{n!} t^n = \sum_{n=0}^\infty \frac{g^{(n-1)}(0)}{n!} t^n... -
anuttarasammyak replied to the thread Undergrad Mixed approximation vs. full approximation for a power series expansion.RHS of (1) would be g which is made of f and t. -
anuttarasammyak replied to the thread Schrödinger’s Cat Again.The cat keeps Schroedinger hear her meow. Quantum Zeno effect saves her life.:wink: -
anuttarasammyak replied to the thread Undergrad Mixed approximation vs. full approximation for a power series expansion.I observe no divergences at t=0 in post #3. Denominator ##V_1=0## at ##t=c_3/c_4## would matter. Say ##f(0)## and function form... -
anuttarasammyak reacted to FranzS's post in the thread Undergrad Mixed approximation vs. full approximation for a power series expansion with
Wow.
Oh well, it's pretty intricated. I'll write it by steps: $$ \begin{align} & f'(t)= - f(t) \cdot \ \frac{V_1'(t) + c_0 F(t)}{V_1(t)}... -
anuttarasammyak replied to the thread Undergrad Mixed approximation vs. full approximation for a power series expansion.$$ f''=\frac{\partial g}{\partial f} f'+ \frac{\partial g}{\partial t} =\frac{\partial g}{\partial f} g+ \frac{\partial g}{\partial t}... -
anuttarasammyak replied to the thread Undergrad Mixed approximation vs. full approximation for a power series expansion.What actually is ##g(f(t),t)## in your case ? -
anuttarasammyak reacted to Charles Link's post in the thread Undergrad Finding the minimum distance between two curves with
Like.
Yes, this way seems to get the result a little easier. I worked the ## y=4-x^2 ## and ## y=(2x-6)^2 ## problem by this method just... -
anuttarasammyak replied to the thread Undergrad Finding the minimum distance between two curves.I got ##x_1=1.8317... \ x_2=3-\frac{x_1}{4}=2.5421...## The equation of ##x_1##: Other two casese : ##(x_1.x_2)=(-1.3444... -
anuttarasammyak replied to the thread Undergrad Finding the minimum distance between two curves.Yes, after we check that the curves do not cross at first. We may include not smooth points and end points on the curve in the survey... -
anuttarasammyak replied to the thread Undergrad Finding the minimum distance between two curves.Find the two points that share the same normal line. It would be a general way as @pasmith showed.



