# Definition:Abbreviation of WFFs of Propositional Logic/Standard Abbreviation

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## Definition

The string obtained by applying as many of the rules for abbreviation of WFFs to a WFF $\mathbf A$ as possible is known as the **standard abbreviation of $\mathbf A$**.

Thus it can be seen that there may be several abbreviations of a WFF, but only one **standard abbreviation**.

## Sources

- 1996: H. Jerome Keisler and Joel Robbin:
*Mathematical Logic and Computability*... (previous) ... (next): $\S 1.4$: Main Connective