mehdi jafari

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11 years, 301 days

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These are questions asked by mehdi jafari

hi every one, i want to get derivative with sacalar function psi, first time ordinary derivative and second time covariant derivative , how should i write that ?!

hi. i have a system of ODEs. is there any answer ? rho is constant !

restart:Physics:-Assume(rho=constant)

{(-constant+rho)::0, (constant-rho)::0}, {(-constant+rho)::0, (constant-rho)::0}

(1)

#rho=10:

sys:={8*g(t)^3*diff(g(t),t$2)+4*(g(t)*diff(g(t),t))^2+1=0,rho=-1/g(t)-2*(diff(g(t),t)+t*diff(g(t),t$2))-t/(2*g(t)^3),rho=(-t/g(t))*(diff(g(t),t))^2+t/(4*g(t)^3)}

{rho = -t*(diff(g(t), t))^2/g(t)+(1/4)*t/g(t)^3, rho = -1/g(t)-2*(diff(g(t), t))-2*t*(diff(diff(g(t), t), t))-(1/2)*t/g(t)^3, 8*g(t)^3*(diff(diff(g(t), t), t))+4*g(t)^2*(diff(g(t), t))^2+1 = 0}

(2)

dsolve(sys)

 

 

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hi every one ! i want to use Assume option to simplify some expression ! but it is not working ! what should i do !?

i have assume that ( a+b+c=0) and i want maple returns me exp(a+b+c) =1 ! but it does not ! what should i do !?


restart:with(Physics):

Assume(a+b+c=0):

about(a+b+c)

a+b+c:

  is assumed to be: 0

 

simplify(exp(a)*exp(b)*exp(c))

exp(a+b+c)

(1)

simplify(exp(a+b+c))

exp(a+b+c)

(2)

 


Download assume.mw

i want parametrix answer for z in terms of w, what should i do ? please help

 

 

``

restart:

P:=w-10*z-1/5*z^2-1/200*z^3-1/500*z^4-z^5-1/1000*z^6

w-10*z-(1/5)*z^2-(1/200)*z^3-(1/500)*z^4-z^5-(1/1000)*z^6

(1)

solve(P,z)

RootOf(_Z^6+1000*_Z^5+2*_Z^4+5*_Z^3+200*_Z^2+10000*_Z-1000*w)

(2)

 

 

 

``

 

Download solve.mw

how can i do this GIFs with maple ?

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