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# IT 422: Intelligence Systems - PowerPoint PPT Presentation

IT 422: Intelligence Systems. FOL Extra. At least two students love AI Ǝ x,y ┐(x=y)  Student(x)  Loves(x,AI)  Student(y)  Loves(y,AI) or ∃x∃y (Student(x)  Loves(x,AI ) ∧ Student(y)  Loves(y,AI) ∧ x ≠ y. Richard has exactly two brothers, John and Geoffrey

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### IT 422: Intelligence Systems

FOL Extra

Ǝ x,y ┐(x=y)  Student(x)  Loves(x,AI)  Student(y)  Loves(y,AI)

or

∃x∃y (Student(x)  Loves(x,AI )∧ Student(y)  Loves(y,AI) ∧ x ≠ y

• Richard has exactly two brothers, John and Geoffrey

Brother (John,Richard ) ∧ Brother (Geoffrey,Richard) ∧ John ≠Geoffrey

∧ ∀x Brother (x,Richard ) ⇒ (x=John ∨ x=Geoffrey)