## 95 Reputation

13 years, 130 days

## How to see the code inside library of Ma...

Maple

any software help to see the Maple code inside the library with extension .lib?

## why modp eliminate 143/2 in polynoimal b...

Maple

> with(CurveFitting); data := [[2, 10], [3, 1], [5, 4], [7, 5]];
[[2, 10], [3, 1], [5, 4], [7, 5]]
> PolynomialInterpolation(data, y);
3  3       2   199     143
...

## Adjoint in DEtools seems different from ...

Maple

i am looking for a command adjoint a ODE, to check whether my understanding of adjoint correct or not, when i find one example different from my understanding as follows

u*diff(Y,t) - diff(U,t) + diff(y,t)*U = 0 where uppercase and lowercase are different

Y -> -u*diff(lambda,t) - diff(u,t)*lambda = miu1
U -> diff(lambda,t) + diff(y,t)*lambda = miu2

why not

Y -> u*diff(lambda,t) = miu1
U -> -diff(lambda,t) + diff(y,t)*lambda = miu2

## do maple have tool to get differential i...

Maple

A := diff(Y,y\$2)-(y11)^2*diff(Y,y) = 0
B := diff(diff(Y,x),y) - y11*diff(Y,x\$2) = 0

do maple have tool to get differential identity, or simple algebra identity?
that identity is an equation in terms of A and B and y11, not Y

## how to do simple parametrization...

Maple

sys := diff(y,t\$3) + 3*diff(y,t\$2) + 5*diff(y,t)  = diff(u,t\$3) + diff(u,t\$2) + diff(u,t)

x1 = diff(y,t)
x2 = diff(y,t\$2)
x3 = diff(y,t\$3)

how to do simple parametrization with x1, x2, x3 on sys, so that get 3 equations in terms of x1, x2, x3, u
result may be first order of x1, x2, x3

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