---
title: 'lecture 03: projection theory for balls in euclidean space'
description: notes on lecture 3, drafted from 0 marks
date: '2026-10-13'
tags:
  - course
  - mit
created: '2026-10-13'
modified: '2026-10-13'
published: '2026-10-13'
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slug: courses/18-156-projection-theory-spring-2025/lectures/03
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---
Source: [[courses/18-156-projection-theory-spring-2025/resources/mit18_156_s25_lec03_pdf|lecture 3]].

## notes