Definition:Specific Sign (Mathematical Theory)

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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].


  1. 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.