Does anyone familiar with a convenient way in Mathematica to define a case function such as:
y(x)=\left\{\begin{array}{c} x \\ -x\end{array}\begin{array}{c} x>0 \\ x<0\end{array}
\right.
?
Thankes,
Omri
Hallo,
I was wondering what is the physical significance of scalar field \Phi (x) as an quantum operator. \Phi (x) have canonical commutation relation such as [ \Phi (x) , \pi (x) ] so it must be an opertor, thus what are his eigenstates?
Thanks,
Omri
Hallo everyone,
I have a word document full of equations in Mathtype and I added a new equation which I wrote in different size and style. Does anyone know how I can change the old equations (not one by one) so their properties (size, style) would be exactly as those of the new equation...
I read to today that soap bubbles explodes due to surface tension regardless of
other forces experienced on the bubble.
how does surface tension does that? does it "drive" the bubble to go larger until it explodes?
Thanks,
Omri
Homework Statement
a rigid sphere of radius R and density \rho1 mooving (linearly) inside a liquid
of densiity \rho0 and viscosity constant \mu
the liquid is in hydrostatic equilibrium under gravitational field g.
what is the velocity of the sphere after a very long time assuming Raynolds...
hey,
i cant understand what is the motivation of defining pair of hole and electron as
a single particle, exciton. thus they seem to have distinct motion and space. so
why still we treat them as excitons?
Hallo everyone,
in electrostatic we have a linear realation between E D and P, i do understand that P
is related to the polaryzation density but what about E and D? which of those represent the
overall field?
Hallo,
I have matrices on my workpace and i need to take the first element from each one
and produce new vector. In other words, i have the matrices D1,D2,D3....D36 on my workspace and by using a For loop i want to generate a new vector:
d=[D1(1,1) D2(1,1)...D3(1,1)].
does anyone know...
Hallo,
I'm looking for a Random function in c++. i tried to use in the function rand()% but
it does not generate a truly uniformly distributed random number in the span (since my span is large. 100000*100000). in other word it dosent generate a random number in equal probabilty in lage...
Hallo,
I have a 3*3 matrices in matlab:
A=[ 1 2 3; 4 5 6; 7 8 9];
and i wont to accept a vector from each colume in an easy way, i.e.
a1=1 2 3 , a2=4 5 6 , a3=7 8 9
so i tried to wrote:
for i=1:3
a_i=A(:,i);
end
but i only the last vector, a3=7 8 9...
if anyone have...
Hallo.
If we consider Rolle's Theorem:
"If f is continuous on [a, b], differentiable in
(a,b), and f (a) = f (b), then there exists a point c in (a, b) where f'(c) = 0."
Why do we need to state continuity of f in interval and differentiability of f in open segment? Why can't we say f...
Hallo,
Does the velocity i simple harmonic oscillator is zero in equilibrium points? if it's true
how does it make sense with the fact that i suppose to get a maximum kinetic
Energy in those points (stable ones)
i would realy appriciate if someone could clear this issue for me...
Hallo,
My teacher wrote that:
"The set has no interior points, and neither does its complement, R\Q" where R refers real
numbers and Q is the rationals numbers.
why can't i find an iterior point?
thanks,
Omri
hall,
i need to prove by using the field axioms that:
(-a)(-b)=ab, i think i know how to this but I'm very insecure with using those
axioms cause i want to make sure I'm not using my intuition.
i tried something like: (-a)(-b)=(-1)(a)(-1)b=(-1)(-1)(a)(b)=ab and i guess it's wrong...
Hallo.
my teacher wrote for the first energy level of a particle in a certain potential
\Delta X \Delta P \approx \frac{\hbar}{2}
exist.
is it a general result for all energy level or there is specific meaning for the first energy level?
infinite potential well and the uncertainty principle
the solution for Schroedinger equation in infinite potential well satisfy the following
energy levels:
where l is the width of the well.
E can't be zero since then \psi=0 so there isn't any particle in the well . i read in...
Hallo,
Why does the field of a infinite plane does not depend on r? i know it's equal to
two \pi\sigma but why does his "infinite" makes it independent on r?
thanks
Omri
Hallo,
i read in Spivak that for every upper bounded non empty sets A and B,
sup(A+B)=sup(A)+sup(B). but later he wrote other prove which claim that
for every function f and g in a close interval exist sup(f+g)<=sup(f)+sup(g)
and not necessarily sup(f+g)<=sup(f)+sup(g). how does...
Hallo,
If I have an hystersis loop (of ferromagnets) in form of scattered points in matlab what is the function or tool which i can use in order drew a continues hystersis curve(loop)?
Thanks,
Omri
Hallo,
I'm looking for explanation for the fact that in many diesel engines we have two springs supporting the piston valves such that one is exterior and the other interior and they have opposite helical direction. Also if anyone have a link or any information it would be very helpful.