richyw
 Name:
 Rich Williams
 School:
 About:
 In my junior year, doing physics.
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Questions Asked

richyw:
Group Title
Help with this integration?
\[\int^\infty_0 \text{erfc}\left(\frac{z}{2\sqrt{kt}}\right) dz\]
 updated 10 days ago
 12 replies
 1 Medal
Mathematics

richyw:
Group Title
How can I solve this triangle for \(\theta\)?
 updated 18 days ago
 3 replies
 No Medals Yet
Mathematics

richyw:
Group Title
Trying to solve this system of equations. Not sure where I am messing up.
I have …
 updated 2 months ago
 No Medals Yet
Mathematics

richyw:
Group Title
This might be stupid, but how do I factor \(z^4+1\).
I can do it by calculating the roots the long way and then write, it out, but what are…
 updated one year ago
 14 replies
 9 Medals
Mathematics

richyw:
Group Title
Find the Laurent series for f(z) in the following regions:
\[f(z)=\frac{1}{z^21}\]
a) 0 < z1 < 2
…
 updated one year ago
 2 replies
 No Medals Yet
Mathematics

richyw:
Group Title
is f(0) undefined?
\[f(z)=\frac{z^3}{z+z^5}\]
 updated one year ago
 4 replies
 1 Medal
Mathematics

richyw:
Group Title
Integrate around C, where C is the positively oriented contour z=5
\[\int_C \frac{e^{1/z}(4z^33)}{z(z^3+1)}\]
 updated one year ago
 3 replies
 No Medals Yet
Mathematics

richyw:
Group Title
having trouble with a series expansion.
\[f(z)=\frac{z+1}{z1}\]I need series expansion in both z<1 and 1<z<∞
 updated one year ago
 7 replies
 1 Medal
Mathematics

richyw:
Group Title
Classifying singular points.\[f(z)=\frac{1}{z(z1)}\]
 updated one year ago
 3 replies
 No Medals Yet
Mathematics

richyw:
Group Title
\[u''=w^2 u\] on 0<y<H with \[u(0,w)=F_1(w)\]\[u(H,w)=F_2(w)\]
 updated one year ago
 7 replies
 2 Medals
Mathematics

richyw:
Group Title
Can someone explain to me how to use the Integrating Factor?
I have\[u_t=ku_{xx}+Q(x,t)\]on \(\infty<x<\infty\) with the initial condition…
 updated one year ago
 20 replies
 2 Medals
Mathematics

richyw:
Group Title
Inverse Fourier transform of \(F(w)=e^{wa}\) where a > 0
 updated one year ago
 13 replies
 2 Medals
Mathematics

richyw:
Group Title
trying to solve this first order pde
\[u_t+xtu_x=0\]\[u(x,0)=f(x)\]\[\infty <x<\infty\]
 updated one year ago
 50 replies
 1 Medal
Mathematics

richyw:
Group Title
moment of inertia about centre of mass for two point masses.
I am struggling with this basic question.
 updated one year ago
 3 replies
 No Medals Yet
Mathematics

richyw:
Group Title
Heat equation with convection.
\[u_t=ku_{xx}+\mu u_x\]\[u(x,0)=\phi(x)\]on \(\infty,\infty)\) with k>0.…
 updated one year ago
 13 replies
 2 Medals
Mathematics

richyw:
Group Title
There should be a way to flag users who abuse the system.
 updated one year ago
 5 replies
 3 Medals
Mathematics

richyw:
Group Title
Java. I am trying to make an array of unique words from a document. Getting a null pointer exception
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

richyw:
Group Title
can somone help me with this derivative?
\[\frac{d}{dz} (1+i)^{z^2}\] assume an appropriate branch cut when necessary.
 updated one year ago
 18 replies
 2 Medals
Mathematics

richyw:
Group Title
good notation for set of all nonzero integers?
 updated one year ago
 No Medals Yet
Mathematics

richyw:
Group Title
is a circle a connected set?
sketch the sets of points determined by\[z+2i=2\]
…
 updated one year ago
 19 replies
 1 Medal
Mathematics

richyw:
Group Title
\[\lim_{ z \to 1} z+1\]
…
 updated one year ago
 5 replies
 No Medals Yet
Mathematics

richyw:
Group Title
Laplace's equation in polar coordinates
\[\Delta u(r,\theta)=0\]…
 updated one year ago
 3 replies
 No Medals Yet
Mathematics

richyw:
Group Title
Trying to find \(\sin^{1}(2)\)
 updated one year ago
 19 replies
 1 Medal
Mathematics

richyw:
Group Title
Trig Identity help!
\[\sin x\left(\sin x +\cos x\right)^2\]
 updated one year ago
 6 replies
 No Medals Yet
Mathematics

richyw:
Group Title
Show that \[\frac{1}{1/z}=z\]for \(z\neq 0\)
…
 updated one year ago
 7 replies
 1 Medal
Mathematics

richyw:
Group Title
Complex Variables: How do I show this limit does not exist
\[f : \mathbb{C}\rightarrow\mathbb{C}\]\[f(z)=z\]
\[\lim_{\Delta z \to 0}\fra…
 updated one year ago
 No Medals Yet
Mathematics

richyw:
Group Title
I should know how to do this by now, but how do I find the maximum and minimum of \[6\sin\left(\frac{\pi}{3}x\right)+2\sin\left(\pi x\right)…
 updated one year ago
 6 replies
 No Medals Yet
Mathematics

richyw:
Group Title
Why can't I post equations?
 updated one year ago
 8 replies
 6 Medals
Mathematics

richyw:
Group Title
Java. How do I round my answer to 6 significant figures?
 updated one year ago
 2 replies
 No Medals Yet
Mathematics

richyw:
Group Title
I need to make a simple program for an assignment. It basically needs to evaluate a function for a number given by the user.
 updated one year ago
 4 replies
 No Medals Yet
Mathematics

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