---
title: 'week 02: relations, cardinality, axiom of choice'
description: notes on week 2, 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/18.901-fall-2004/lectures/02
permalink: https://aarnphm.xyz/courses/18.901-fall-2004/lectures/02.md
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---
## notes