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MaplePrimes Activity

These are replies submitted by Earl

@MapleMathMatt Thanks to you I now understand the meaning of map's index. BTW this also works:

`~`[P]([A1, A2, A3, A4], [B1, B2, B3, B4])

@MapleMathMatt I have a lot to learn about map. How does its action change when map is followed by a tilde?

@Joe Riel There is a lot to learn about how map performs. The advice below by MapleMathMatt 55 is informative

@Joe Riel Interesting that the A's must be a list of lists but the B's are a simple list.

Thank you, Acer. These York University tutorials with examples will help me greatly to understand the basics of Special Relativity.

@Pascal4QM The examples you have given will help.

@Pascal4QM I am a beginner working only with special relativity.

I have loaded the Physics package and I think I understand the use of the Coordinates command to define the components of a spacetime vector.

Please show me the Physics commands or a sample worksheet, which define the space time interval and the 4-Velocity.

Later, I will probable seek help with the definition and manipulation of tensors.

@acer You have generously increased my understanding of Maple's solve and eliminate commands. Much appreciation.

@John Fredsted Your solution was the one I expected from my command. I'll use your method in the future.

@vv I didn't realize that parametric had to be stated when the equations for solve, as in your example, include an implied condition.

It is interesting that to obtain a correct solution one must solve for all "variables" even though one of them, y in your example, already has a stated value. 

@Kitonum Please explain how your commands below cause Maple to determine the period. I particularly do not understand how f-1 represents an equation.

T:=fsolve(f-1, 2..2.5); 
 # The period

@Kitonum I believe I now fully understand your excellent graphical application of my original pair of equations.

@Kitonum How do you know that solving Sys for y = 1/2 gives you the point on the circle for the initial value of the parameter t=0? 

@Carl Love  I was not aware of command membertype which greatly increases the scope of select/remove.

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