Pumping up your language

A formal language can be shown to be non-regular using a theorem called the Pumping Lemma, which states that any string beyond a certain length which belongs to a regular language can be divided into three strings, where repeating the middle string produces another string in the language.  A similar theorem, the uvwxy theorem, does the same thing for context-free languages.
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To be or not to be, that is the proposition

Boolean algebra is a foundation for several fields of mathematics, logic, and computing, including

• propositional calculus
• set theory
• computer hardware design
• computer programming
• document search criteria.

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