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Mathematically, an anti-E and an anti-E! What does it mean to add a letter?
Words like "you yi" and "at least one" are usually called existential quantifiers in logic.

Its symbolic representation is "anti-E". A proposition with this word is called a special proposition.

"Dao A" is a full-name quantifier. A proposition with the words "all" and "arbitrary" is called a universal proposition.

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