# 5.155 explained — Tractatus Logico-Philosophicus

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

## What happens

Wittgenstein defines the unit of the probability proposition as the assignment of a degree of probability to a definite event based on circumstances that are not further known.

## Character check-ins

### Mr. Wittgenstein

Author of the proposition

## Key lines

> The unit of the probability proposition is: The circumstances⁠—with which I am not further acquainted⁠—give to the occurrence of a definite event such and such a degree of probability.

The basic form of a probability statement is that unknown circumstances assign a specific likelihood to a particular event.

_Clarifies the minimal structure of probability claims_

## Links

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