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In abstract algebra, a monadic Boolean algebra is an algebraic structure A with signature

where ⟨A, ·, +, ', 0, 1⟩ is a Boolean algebra.

The monadic/unary operator ∃ denotes the existential quantifier, which satisfies the identities :

∃x is the existential closure of x. Dual to ∃ is the unary operator ∀, the universal quantifier, defined as ∀x := '.

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