\begin{definition}[Definition:Link (Bourbaki Theory)]
An assembly in {{AuthorRef|Nicolas Bourbaki|Bourbaki}}'s exposition of a mathematical theory is specified as being:
* A succession of signs written one after another;
* Certain signs which are not letters can be joined in pairs by '''links''', as follows:
:$\overbrace {\tau A \Box}^{} A'$<ref>The specific symbology used by {{AuthorRef|Nicolas Bourbaki|Bourbaki}} in {{BookLink|Theory of Sets|Nicolas Bourbaki}} has not been rendered accurately here, as the author of this page has not been able to establish a method by which to do it. However, the intent has been expressed as accurately as possible.</ref>
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\end{definition}