# Definition:Specific Sign (Mathematical Theory)

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## Definition

A **specific sign** of a mathematical theory is a symbol which is defined according to the use to which the theory is being put.

## Bourbaki Definition

The mathematical theory as defined in Bourbaki's *Theory of Sets* defines the **specific sign** of set theory as follows:

The **specific signs** of the theory of sets are $=, \in, \supset$^{[1]}.

## Notes

- ↑ The specific symbol for $\supset$ that Bourbaki uses is in fact a bold, sans-serif, uppercase, backwards $\text{C}$. However, the author of this page has been unable to find an appropriate $\LaTeX$ code which will render this symbol properly.

## Sources

- 1968: Nicolas Bourbaki:
*Theory of Sets*... (previous) ... (next): Chapter $\text I$: Description of Formal Mathematics: $1$. Terms and Relations: $1$. Signs and Assemblies