---
title: "Query-to-KV head mapping mathematical notation"
description: "Query-to-KV head mapping is a recurring research-paper notation family. Maps each query-head index to the key-value head whose cache and projections that…"
canonical_url: "https://fanout.sh/labs/math-decoder/symbol/head-group-mapping"
md_url: "https://fanout.sh/labs/math-decoder/symbol/head-group-mapping.md"
last_updated: "2026-08-09"
access: "public"
---

# Query-to-KV head mapping mathematical notation

Query-to-KV head mapping is a recurring research-paper notation family. Maps each query-head index to the key-value head whose cache and projections that…

## Public overview

Query-to-KV head mapping is a recurring research-paper notation family. Maps each query-head index to the key-value head whose cache and projections that query head shares.

Query-to-KV head mapping: Maps each query-head index to the key-value head whose cache and projections that query head shares. Example: Select the shared KV head assigned to query head h.

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