Jacobe supta

## 125 Reputation

11 years, 173 days

## ricci...

@ecterrab for R^ab R_ab , is Ricci[alpha,beta].Ricci[alpha,beta] correct ?

## its works...

@ecterrab i uptodated my maple to 18 and its works. thx so much , its illustrative. what about R^ab R_ab ?

## thank you...

@ecterrab  thank you very much , but the first line gave the error, (in physics:-setup) wrong left-hand-side in metric = dtheta^2+sin(theta)^2 dphi^2, quite):

## thx...

@Torre  what about R^ab R_ab ? . acutually i didnt understand the role of 1 in (g,R,[1]) and i dont know how to calculate other components of ricci or rieman tensor. if you can explain and apply the method of using of these commands with a simple metric ,i really appreciate.

## riemann tensor and ricci tensor...

@Torre  thank you for your help. how to find riemann tensor components ? e.g R_φθφθ . and ricci tensor components.

## dynamical system :...

dynamical system :

## @Preben Alsholm brilliant work ! ap...

@Preben Alsholm brilliant work ! appreciate what you have done .

## @Preben Alsholm brilliant work ! ap...

@Preben Alsholm brilliant work ! appreciate what you have done .

## thanks...

@PatrickT thank you for your help.

## thanks...

@PatrickT thank you for your help.

## i've got it all...

@Preben Alsholm thanks .i am curious too see can we plot a diagram for our two critical points , as the photo i attached ?for e.g. , the saddle point ?

best regards

jacobe

## i've got it all...

@Preben Alsholm thanks .i am curious too see can we plot a diagram for our two critical points , as the photo i attached ?for e.g. , the saddle point ?

best regards

jacobe

## i've got the point you indicated...

i've got the point you indicated , thank you so much .

and i think we can plot the 2D phase space for xy with z=0 . or z=-5/8 , am i right ?

regards

jacobe

## i've got the point you indicated...

i've got the point you indicated , thank you so much .

and i think we can plot the 2D phase space for xy with z=0 . or z=-5/8 , am i right ?

regards

jacobe

## Thank you...

Thank you for your time Preben Alsholm , i'm using your worksheet for another system and will show you my result when it's done.

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