# 5.142 explained — Tractatus Logico-Philosophicus

> Chapter companion for Tractatus Logico-Philosophicus by Ludwig Wittgenstein.

## What happens

A tautology is a proposition that follows from all propositions and says nothing, emphasizing its vacuous nature.

## Themes in this chapter

### Logic and Tautology

This proposition defines tautology as a logical consequence of all propositions that conveys no factual content.

## Key lines

> A tautology follows from all propositions: it says nothing.

A tautology is entailed by any proposition because it provides no information about the world.

_Clarifies the nature of tautologies as empty yet logically valid statements._

## Links

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