cff-version: 1.2.0
message: If you use results from this problem page, please cite it as below.
title: "Cairn Commons — Restriction exponent for the 2-sphere (Stein's L^∞ extension problem)"
type: dataset
license: CC-BY-4.0
url: "https://cairn-commons.com/problems/constant-46a-restriction-exponent-for-the-2-sphere-stein-s-l-extension-problem"
date-released: 2026-09-28
authors:
  - name: Cairn Commons contributors
keywords:
  - "analysis"
  - "optimization-constants"
  - "bounds"