# Questions tagged [products]

Questions about the use of Product, NProduct, and other types of multiplication, like Dot.

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### Are there built in vector cross product identities?

I want to be able to simplify expressions of vectors, such as: Cross[Cross[x,p],Cross[Cross[y,q],Cross[x,p]]] I know I could create my own rule sets, however I'd ...
• 1,055
1 vote
77 views

### How to use these many conditions inside product?

I have tried all the way but I could not find a code for that line. It is consisting of three conditions.
1 vote
69 views

### How to verify a FactorialPower identity?

How to verify that FactorialPower[x, m*n, k] is always the same as Product[FactorialPower[x - i*k, n, m*k], {i, 0, m - 1}] ...
452 views

### Why do I get different results for the products of two identical expressions?

I have two expressions with the Gamma function that are identical: ...
• 3,169
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### Pattern recognition for products of variables

Pattern recognition doesn't work as I would expect when trying to match products, for example Cases[a[1] b[1] a[2] b[2], x___ a[k_] b[k_] -> k, All] {1} ...
65 views

### Expanding Pochammer symbols/Gamma function for simplifying expressions

TLDR: How to expand gamma functions or Pochammer symbols in an arbitrarily long product? Some context I am trying to find out a closed-form expression for $\langle r^\alpha\rangle$ for the non-...
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1 vote
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### Taking the derivative of a product

EDIT: see here I am new to Mathematica and I am trying to work though deriving the maximum likelihood estimator for the Poisson distribution as an exercise to familiarize myself with how Mathematica ...
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110 views

### Kronecker Product for arbitrary number of spins

I want to write a function that can perform the following kronecker product: ...
1 vote
299 views

### How to define replacement rule for Minkowski inner product

following question, I have an expression that consists of several Minkowski inner products between 2 four vectors written as in Mathematika: ...
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203 views

• 3,169
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