Questions Asked

henpen:
Group Title
Number theory question: Is there a general way of finding all integer n for which \[\frac{\prod_{i=1}^n \left( a_i + b_i n \right)}{c + d n}…
 updated one year ago
 31 replies
 No Medals Yet

henpen:
Group Title
Why is this integral of tan incorrect?
Note: change all x on my 3rd and 4th comment apart from those on the very first line of the 3rd comm…
 updated one year ago
 36 replies
 5 Medals

henpen:
Group Title
Is there a deeper explanations for why Laplace transforms work (like Fourier transforms, which have the theory that any periodic function is…
 updated one year ago
 1 reply
 No Medals Yet

henpen:
Group Title
What's the proof that the variance of a Bernoulli distribution is \[ p(p1)\]?
 updated one year ago
 3 replies
 1 Medal

henpen:
Group Title
Why here is gravitational force not \[\frac{MGm}{r^2}\]?
 updated one year ago
 5 replies
 No Medals Yet

henpen:
Group Title
Could someone check my solution to this?
A shell explodes on the surface of horizontal ground. Earth is scattered in all directions with…
 updated one year ago
 16 replies
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henpen:
Group Title
Prove elegantly that \[n^5=n \mod 10\].
Is there a way of doing this without enumerating all the digits?
 updated one year ago
 No Medals Yet

henpen:
Group Title
Could some kind person check my proof that gcd(n!, n!+1)=1?
 updated one year ago
 8 replies
 2 Medals

henpen:
Group Title
Why does \[x(t) \frac{d}{dx}f(x(t)^2)=2f(x(t)^2)\]?
 updated one year ago
 13 replies
 3 Medals

henpen:
Group Title
Find the smallest nonzero t for
\[t(ba)=0 \mod(ab) \]
 updated one year ago
 11 replies
 3 Medals

henpen:
Group Title
Is the reason that a wave packet's wavelength is undefined that it is a Fourier sum of many wavelengthedfunctions?
 updated one year ago
 No Medals Yet

henpen:
Group Title
Schroedinger equation question.
 updated one year ago
 2 replies
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henpen:
Group Title
What are the applications of (1) number and (2) group theory outside pure mathematics?
 updated one year ago
 No Medals Yet

henpen:
Group Title
What conditions need to be met for \[\lim _{x \rightarrow c} (\frac{g(x)}{f(x)})= \frac{\lim_{x \rightarrow c} g(x)}{\lim_{x \rightarrow c} …
 updated one year ago
 10 replies
 1 Medal

henpen:
Group Title
Is \[\lambda= \frac{h}{p} \] an approximation?
Using c=1, v as a fraction of c,…
 updated one year ago
 6 replies
 1 Medal

henpen:
Group Title
What's wrong with this infinite square well?
 updated one year ago
 12 replies
 1 Medal

henpen:
Group Title
Why does the wavefunction's second derivative not have to be continuous?
 updated one year ago
 10 replies
 1 Medal

henpen:
Group Title
Friction problem
 updated one year ago
 8 replies
 No Medals Yet

henpen:
Group Title
Friction intuition help
 updated one year ago
 4 replies
 No Medals Yet

henpen:
Group Title
Why:\[lim(w \rightarrow w_0)(\frac{ww_0}{e^we^{w_0}})=\frac{1}{e^{w_0}}\]?
 updated one year ago
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henpen:
Group Title
Solve \[\sin(x+iy)=0\]
 updated one year ago
 9 replies
 2 Medals

henpen:
Group Title
How to solve the equation \[e^x=e^{x}\]?
 updated one year ago
 2 replies
 No Medals Yet

henpen:
Group Title
\[sin(x+iy)=sin(x)cos(iy)+sin(iy)cos(x)=sin(x)cosh(y)+isinh(y)cos(x)\]
\[sin(x+iy)^2=?\]…
 updated one year ago
 4 replies
 No Medals Yet

henpen:
Group Title
Lagrangian mechanics: Is the definition \[\frac{\partial \mathbf{U}}{\partial \mathbf{x}}=\mathbf{F}\] arrived at only by minimising action…
 updated one year ago
 2 replies
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henpen:
Group Title
Is the definition \[\frac{\partial \mathbf{U}}{\partial \mathbf{x}}=\mathbf{F}\] arrived at only by minimising action (that is, using the E…
 updated one year ago
 2 replies
 No Medals Yet

henpen:
Group Title
Why does the determinant thing for working out cross products work?
 updated one year ago
 3 replies
 1 Medal

henpen:
Group Title
Is reduction of order employed to find both complimentary and particular solutions?
 updated one year ago
 1 reply
 1 Medal

henpen:
Group Title
Mathematically, prove that there are there no arbitrary constants required for the particular solution of \[Ly=f(x)\].
 updated one year ago
 10 replies
 No Medals Yet

henpen:
Group Title
\[Ly=h(x)\]
f is the linear combination of all the functions that are L(function)=0, so that…
 updated one year ago
 No Medals Yet

henpen:
Group Title
Why do we still not have subsections for physics?
 updated one year ago
 6 replies
 5 Medals
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