# 3.317 explained — Tractatus Logico-Philosophicus

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

## What happens

Wittgenstein explains that the determination of the values of a propositional variable is achieved by describing the propositions that share a common mark. This description deals only with symbols and their form, not with their meaning, and asserts nothing about what is symbolized. The specific method of description is inessential.

## Themes in this chapter

### Logical Atomism

The focus on propositional variables and their determination reflects the atomistic approach to breaking down propositions into their symbolic components.

### Limits of Language and Thought

The emphasis on describing symbols without reference to meaning highlights the boundaries of what language can express about reality.

## Character check-ins

### Mr. Wittgenstein

Author of the Tractatus, presenting the nature of propositional variables and symbolic description.

## Key lines

> The determination of the values of the propositional variable is done by indicating the propositions whose common mark the variable is.

To assign values to a propositional variable, we point to the propositions that share a common feature, which the variable represents.

_Clarifies the method of defining variables in logical notation._

> The determination will therefore deal only with symbols not with their meaning.

So this assignment concerns only the symbols themselves, not what they stand for.

_Emphasizes the formal, non-semantic nature of the determination._

## Links

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