---
title: "Mutual information mathematical notation"
description: "Mutual information is a recurring research-paper notation family. Measures how much knowing either random variable reduces uncertainty about the other…"
canonical_url: "https://fanout.sh/labs/math-decoder/symbol/mutual-information"
md_url: "https://fanout.sh/labs/math-decoder/symbol/mutual-information.md"
last_updated: "2026-08-09"
access: "public"
---

# Mutual information mathematical notation

Mutual information is a recurring research-paper notation family. Measures how much knowing either random variable reduces uncertainty about the other…

## Public overview

Mutual information is a recurring research-paper notation family. Measures how much knowing either random variable reduces uncertainty about the other through a KL divergence from independence.

Mutual information: Measures how much knowing either random variable reduces uncertainty about the other through a KL divergence from independence. Example: Compare the true joint behavior with what independence would predict.

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