---
title: "Rectified linear unit mathematical notation"
description: "Rectified linear unit is a recurring research-paper notation family. Keeps positive scalar inputs unchanged and replaces negative scalar inputs with zero."
canonical_url: "https://fanout.sh/labs/math-decoder/symbol/relu"
md_url: "https://fanout.sh/labs/math-decoder/symbol/relu.md"
last_updated: "2026-08-09"
access: "public"
---

# Rectified linear unit mathematical notation

Rectified linear unit is a recurring research-paper notation family. Keeps positive scalar inputs unchanged and replaces negative scalar inputs with zero.

## Public overview

Rectified linear unit: Keeps positive scalar inputs unchanged and replaces negative scalar inputs with zero. Example: Discard negative entries and retain positive ones.

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