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Example of Knowledge Base

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  1. Example of Knowledge Base

  2. Knowledge Base: example • According to American Law, selling weapons to a hostile nation is a crime • The state of Nono, is an enemy, it has some missiles • All missiles were sold to Nono by colonel West, who is an American • Proof that colonel West is a criminal

  3. Knowledge Base: • . . . Selling weapons to a hostile nation by an American is a crime: • American(x) ^ Weapon(y) ^ Sells(x, y, z) ^ Hostile(z) Criminal(x) • Nono . . . Has some missiles, i.e. Exists x Owns(Nono, x) ^Missile(x): • Owns(Nono, M1) ^ Missile(M1) • . . . All missiles were sold to Nono by colonel West • ForAllx Missile(x) ^ Owns(Nono, x) Sells(West, x, Nono) • Missiles are weapons: • Missile(x) Weapon(x) • Enemy of America is Hostile: • Enemy(x, America)  Hostile(x) • West, is an American. . . • American(West) • State Nono, is an enemy of America.. . . • Enemy(Nono, America)

  4. Forward Chaining: example

  5. Forward Chaining: example

  6. Forward Chaining: example

  7. Backward Chaining: example

  8. Backward Chaining: example

  9. Backward Chaining: example

  10. Backward Chaining: example

  11. Backward Chaining: example

  12. Backward Chaining: example

  13. Backward Chaining: example

  14. Resolution: example