---
title: "Eligibility trace mathematical notation"
description: "Eligibility trace is a recurring research-paper notation family. Maintains a decaying memory of recently active features or gradients so later TD errors…"
canonical_url: "https://fanout.sh/labs/math-decoder/symbol/eligibility-trace"
md_url: "https://fanout.sh/labs/math-decoder/symbol/eligibility-trace.md"
last_updated: "2026-08-09"
access: "public"
---

# Eligibility trace mathematical notation

Eligibility trace is a recurring research-paper notation family. Maintains a decaying memory of recently active features or gradients so later TD errors…

## Public overview

Eligibility trace is a recurring research-paper notation family. Maintains a decaying memory of recently active features or gradients so later TD errors assign temporal credit backward.

Eligibility trace: Maintains a decaying memory of recently active features or gradients so later TD errors assign temporal credit backward. Example: Apply today's prediction error to recently eligible parameters.

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