---
title: math (latest version)
description: API reference for qiskit_noise_learning.math in the latest version of qiskit-noise-learning
source: https://quantum.cloud.ibm.com/docs/en/api/qiskit-noise-learning/math
---

# Math

`qiskit_noise_learning.math`

General mathematical objects.

## Classes

|                                                                                                                                                         |                                                                          |
| ------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------ |
| [`IndexedMatrix`](/docs/api/qiskit-noise-learning/generated/math-indexed-matrix "qiskit_noise_learning.math.IndexedMatrix")                             | A matrix with float entries and arbitrary row and column index data.     |
| [`EnumeratedIndexedSpace`](/docs/api/qiskit-noise-learning/generated/math-enumerated-indexed-space "qiskit_noise_learning.math.EnumeratedIndexedSpace") | An indexed space backed by an explicit finite collection of indices.     |
| [`IndexedSpace`](/docs/api/qiskit-noise-learning/generated/math-indexed-space "qiskit_noise_learning.math.IndexedSpace")                                | Abstract description of a vector space with arbitrary basis index types. |
| [`IndexedVector`](/docs/api/qiskit-noise-learning/generated/math-indexed-vector "qiskit_noise_learning.math.IndexedVector")                             | A vector of floats with arbitrary index, or axis label, data.            |
| [`ComposedLinearMap`](/docs/api/qiskit-noise-learning/generated/math-composed-linear-map "qiskit_noise_learning.math.ComposedLinearMap")                | A linear map formed by composing a chain of maps.                        |
| [`LinearMap`](/docs/api/qiskit-noise-learning/generated/math-linear-map "qiskit_noise_learning.math.LinearMap")                                         | An implicit linear map between two indexed spaces.                       |