## 75 Reputation

10 years, 278 days

## 3D phase space with directional field...

Maple

hello guys,

i have a system of autonomous equations which i want to plot its 3D phase space with directional field,

i have some problem with it :dy.mw , and i dont know how to command for add some directional field for 3D phase space .

thank you guys

## Anholonomic frame...

Maple

guys,

how can i compute a tensorial term ( dAlembertian ,..) in anholonomic frame ?

On.mw

## refer to an equation with its number...

Maple

pals ,i have problem when i want to refer to a number of an equation :

num.mw

thanks

## Covariant Derivative and Covariant Tenso...

guys , i have a metric and i want to define a componenets of a tensor and then obtain its covariant derivative with respect to a metric, what is your idea ?

N_1=-A(r)^1/2 , A_2=A_3=A_4=0 , what is D_[nu] N_1 =?

in general i want to define N[1]=-A(r)^(1/2) and N[2] = N[3]= N[3] = N[4] = 0 And define F[mu, nu] = 2*(D_[mu] N[nu]-D_[nu] N[mu]) And define Omega[mu, nu] = 2*(D_[mu] N[nu]+D_[nu] N[mu]) and compute expression F_[alpha, beta] F_[~alpha`, ~beta ] And N_[alpha] N_[~beta`] F_[ ~alpha, ~lambda ] Omega_[beta, lambda])

i have problem with this how to difine this tensorial terms and how to compute them.

thxxxx

## d'alembertian for a metric...

sh.mw

guys i have a metric and i want to find its d'alembertian. what is your idea ?

thanks

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