The pumping lemma for context-free languages, also known as the Bar-Hillel lemma, is a lemma that gives a property shared by all context-free languages.
Read more about Pumping Lemma For Context-free Languages: Formal Statement, Informal Statement and Explanation, Usage of The Lemma
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—Henri-Frédéric Amiel (1821–1881)
“The very natural tendency to use terms derived from traditional grammar like verb, noun, adjective, passive voice, in describing languages outside of Indo-European is fraught with grave possibilities of misunderstanding.”
—Benjamin Lee Whorf (1897–1934)