---
title: "Indicator function mathematical notation"
description: "Indicator function is a recurring research-paper notation family. Returns one when a stated condition is true and zero when it is false."
canonical_url: "https://fanout.sh/labs/math-decoder/symbol/indicator-function"
md_url: "https://fanout.sh/labs/math-decoder/symbol/indicator-function.md"
last_updated: "2026-08-09"
access: "public"
---

# Indicator function mathematical notation

Indicator function is a recurring research-paper notation family. Returns one when a stated condition is true and zero when it is false.

## Public overview

Indicator function: Returns one when a stated condition is true and zero when it is false. Example: Return one for positive x and zero otherwise.

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