Questions tagged [operators]
Questions about using or composing operators--functional mappings from one state or vector space to another.
284 questions
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Allow all functions to "commute" with custom operator except for differentiation
I'm trying to implement expected value angle brackets with all the rules of expected values built in, so that I can symbolically manipulate complicated expressions involving expected values, but I'm ...
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Securing the function definition containing CircleTimes
I'm trying to create a function that handles operators. The only thing left to do is implement the commutator. The minimal working example of func is
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Programmatic construction of a differential operator
I am trying to construct a linear differential operator programmatically. My approach is based on the worked-out example in the NonCommutativeMultiply documentation....
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What is the precedence of logical operators in Wolfram Language?
I'm taking the enjoyable (but very high-level) Wolfram U course in Discrete Mathematics. That course gives the logical operator precedence as ...
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Issue with Applying Derivative Operators in Matrix Multiplication in Mathematica [closed]
I am working on a matrix multiplication problem where I have two matrices, MatA and MatB. ...
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Constructing operator $E_1 \otimes E_2 \otimes \cdots $
I am working with the Bose-Hubbard model and I want to construct the following operator as described below.
I have $L$ lattice sites where I want to construct this operator $e^{i*\phi*N_{R1}}$ where $...
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How to Compute the Hermitian Conjugate of Non-Commutative Products Symbolically in Mathematica?
I am working on symbolic quantum mechanics calculations in Mathematica, where I need to compute the Hermitian conjugate of expressions involving non-commutative operators. For instance, I have ...
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How to Expand and Simplify a Complex Hamiltonian in Mathematica?
I am working on a quantum system and need to expand and simplify a Hamiltonian in Mathematica. The Hamiltonian is given as:
$$
H_{I} = \hbar \frac{\chi}{2} a_{1}^{\dagger 2} a_{1}^{2} + \left(i\hbar \...
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Properties of conjugate transpose
I need to define the properties of conjugate transpose in mathematica:
Properties of Conjugate Transpose:
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306
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Repeated partial derivatives
Big Mathematica novice here, hopefully this isn't too trivial?
I would like to define a function in Mathematica that takes $f$ as an input and produces repeated applications of the operator $\Theta_\...
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Variable-Size Matrix
How can I let Mathematica tell me that trace(Identity matrix)=n for n by n identity matrix? It's easy for human but what would a Mathematica code be?
A harder task: How can I let Mathematica tell me ...
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Problems with defining a R(c)-linear operator
My objective is to define an opeartor op such that for every rational function $f(c)$ of a fixed symbol c, $op(f(c) x)=f(c) op(x)$. What is a good way to implement ...
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Clebsch–Gordan coefficient calculation for L-S basis in system of three particles
I am trying to calculate eq (A3)
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General solution of a differential equation
I'm a beginner in Mathematica and I'm learning about dealing with differential equations but I'm stuck in this problem
What I tried to do is I observed that I have the same differential operator ...
