# Questions tagged [differentials]

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### How to make code for boundary value problem?

I am trying to make graphs given by using this code but I failed. Please correct this code. ...
62 views

### Taking derivative takes forever and the output with Root and pound sign

I'm taking derivative under assumptions on parameters and it is taking forever. Here is my code: ...
24 views

### Prevent recursion in Derivative of Piecewise condition

Can I prevent a RecusionLimit error when taking this derivative ut := a/Nt Nt := Piecewise[{{At, ut >= At}, {1, ut < At}}, 0] D[Nt, At] 
1 vote
43 views

### Symbolic differentiation in functions and plugging only after the derivative has been done [duplicate]

I am doing some symbolic manipulation and misunderstand Mathematica. The code is as such: ...
1 vote
90 views

1 vote
103 views

### How to perform the first and second derivatives of Nth polynomials?

Suppose  $P(x,y)=\displaystyle\sum^{N}_{i+j=0}\alpha_{ij}x^{i}y^{i} \equiv \alpha_{00}+\alpha_{10}x+\alpha_{01}y+a_{11}xy+\ldots+a_{0N}y^{N}$ is a multivariable polynomial of $N$th degree. I want to ...
80 views

### How to evaluate these derivatives

I'm trying to evaluate the following functions S1,S2 and their derivatives: As you can see the S1 and it's derivatives it's working but for the S2 and it's derivatives I'm getting the error displayed ...
132 views

### Second order differential operator in Mathematica

I am trying to write the code for the following expression in Mathematica: $$\partial_{x} e^{-g x}=-g e^{-g x}+e^{-g x} \partial_{x}\,.$$ I was able to do so with the help of the following links with ...
303 views

### Mathematica: Partial derivative with respect to tensors

Anyone know how to do the partial derivative of a tensor in d dimensions on Mathematica ? I want to implement something which will calculate directly like that :
1 vote