Would someone please give me the correct syntax for finding extrema on a closed interval for

f(x) = 3x^4 - 4x^3  on the interval [-1, 2]

that would include the left & right endpoints should one of those be the maximum or minimum.

Alla

Last week I asked about manipulating a Matrix into the form:

pts := [[x1,y1],[x2,y2]...[xn,yn]]

I was directed to use the zip function, which after some trial and error I have "successfully" done. The problem I am having (I think) is that I am using Maple9. Using the zip function as in the example:

Hi,

I need to solve the heat diffusion equation in a system with two enclosed walls.  The first wall (made of a material called fr4) goes from x=0 o x=d1, and the second wall (made of copper, that is cu)from x=d1 to x=d2. 

u(x,t) is my unknown (change of temperature with time and space) for the first wall, and v(x,t) the unknown for the second wall.

So the system of PDEs to solve is:

>PDE:=[ diff(u(x,t),t) = afr4*diff(diff(u(x,t),t) ,

Hi!

I have a function in 2 variables - lets make it easy, the function is:

f(beta,c_0) = beta-6*beta*c_0+3*beta*c_0^2

I want to know in which regions this function has positive values and where it is negative. Tried it with the command contourplot, but this is not telling me anything :(.

Hope somebody can help

Thx
 

Hello,

is there any way to solve a system like (d denotes the derivates):

f₁(x₁,x₂,y₁,y₂)=0

f₂(x₁,x₂,y₁,y₂)=0

dg₁(x₁,x₂,y₁,y₂)/dy₁=0

dg₂(x₁,x₂,y₁,y₂)/dy₂=0

Hi there, could someone help me plot zeta(0.5 + it) as seen here - en.wikipedia.org/wiki/File:Zeta_polar.svg

I assume I need to import some complex plot package?

This may have an annoyingly simple answer but I cannot seem to plot the prime counting function

with(numtheory):
plot(pi(x), x=0..100);

This just gives me an empty plot.  Any ideas?