# Questions tagged [operators]

Questions about using or composing operators--functional mappings from one state or vector space to another.

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### Apply central difference formula to a variable twice

I am working with finite difference methods analytically and I would like to be able to perform operations on subscripted variables. I would like to generate the following expression by applying a ...
264 views

### How can I construct a determinant-type differential operator?

How can I construct a determinant-type differential operator, where the multiplication of elements in the determinant represents the composition of multiple differential operators? \begin{align*} \...
40 views

### Nested RowBox in MakeExpression reports error when I define my own curl operator, but the single RowBox in MakeExpression works well

I want to define my own vector notation so that the input \[Del] \[Cross] a outputs curl[a] while the ...
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30 views

### Confusing abnormalities observed when counting a specific operator in an expression [duplicate]

Recently I have met with some confusing abnormalities when trying to determine if there is a specific operator (usually Plus[] ) in an expression by programming. ...
84 views

### How to convert an expression of several variables into an operator

Given the expression How can I define the following operator like g[u_, v_] := eq1 The correct definition is
161 views

### How to subtract a list from certain sublists of a list? [closed]

I have a problem in doing an operation on this vector {{2,3},{3,4},{5,6}}-{1,1} I want to minus this to get the result ...
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 ...
54 views

### How to write the expression for first order differential operator in Mathematica?

How to write the expression for first order differential operator in Mathematica? What I mean to say that I want to evaluate $$\frac{\partial}{\partial x}f(x)=f'(x)+f(x)\frac{\partial}{\partial x}.$$ ...
92 views