# Questions tagged [operators]

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

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### How to give a property to a list of functions?

For example, I have defined a bunch of binary functions Sum1, Sum2, Prod1, ...
• 123
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### Visualizing order of operations

TreeForm[HoldForm[ (9-2^2+10 8)/9]] produces this: Is there a way to use Divide instead of ...
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### Evaluating a scalar product of a vector and a differential operator vector

I created a scalar product of a vector $\in \mathbb{R}^2$ and of a vector consisting of a differential operators ...
218 views

### Coordinate transformation can this be done with AffineTransform?

Looking for alternatives or improvements for accomplishing the following: Given the position of points A, B, and C in both the x-y and u-v planes, determine transformation functions to map values ...
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1 vote
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### Performing operator expression on a function

What I want. I write an operator expression, and Mathematica performs it on a function. Examples: E^(b D): f[x] -> f[x+b] ...
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### Dealing with infinite matrices in Mathematica?

Is there a mechanism of dealing with infinite matrices in Mathematica, and in particular, with linear operators, corresponding to those matrices? For instance, automatic simplification of operator ...
• 2,751
1 vote
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### Whole 2 line code, producing a bug (infix operator)

Copy the following code, and create new 0 byte file, and paste the code and save it to TEST.nb ...
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1 vote
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### Generating composed operators using Table

Given an operator with two argumentsf[#1,#2]& and some positive (evaluated) integer n, I want to generate the operator ...
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1 vote
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### Composition of functions and operator forms of built-in functions

I am trying to replicate the behaviour of some of the built-in operator forms (for Map, Apply etc) but struggling to understand ...
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1 vote
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### Mathematica Refuses to Output ContourIntegral and DoubleContourIntegral in Nice Mathematical Notation

I experience a strange behaviour of handling the Contour and Double Contour Integral symbols \[ContourIntegral] and \[DoubleContourIntegral] in Mathematica. Whatever I try theyy behave differently ...
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### Simplifications and error in matrix integral operator

I defined the matrix integral operator ...
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1 vote
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### DIsplaying the product of matrix operations

I am struggling to find out the option that show the final result of a matrix operations and not the necessary steps to achieve the result. The last line of the following picture demonstrates the ...
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### How to apply a function if an expression evaluates to true

I'm trying to define a simple function that will accept a symbol and an expression, set the symbol equal to the expression, and then print out info about the equation. Like so: ...
106 views

### commutator between tensor products

I am interested in some quantum mechanical calculations in Mathematica. I am working with a tensor product of Hilbert spaces $\mathcal H = \mathcal H_1\otimes \mathcal H_2$. I would like to implement ...
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1 vote
135 views

### Quantum Mechanics operators

$$\sigma_{z}^{A}|\downarrow\rangle_{A}=-|\downarrow\rangle_{A}$$ $$\sigma_{z}^{A}|\uparrow\rangle_{A}=|\uparrow\rangle_{A}$$ We have the above relations in Quantum mechanics. Is there a way to ...
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### Define an operator with the distributive property that works in general expressions

This is a follow up to this question. In that question they use TagSetDelayed to give a symbol the distributive property. In my case this becomes ...
467 views

### Partial transpose of 8x8 density matrix?

Please could someone help me to knew how to compute the partial partial-transposition of the following matrix? mat = Table[ρ[i, j], {i, 1, 8}, {j, 1, 8}]
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### How to define derivative operation of a series acting on normal function

In some cases, I have to do derivarive of higher order acting on some function successively. Here is a toy example: I have a function named myfunc: ...
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