"Tugas 4 Rangkuman Materi Aljabar Boolean"

 Aturan – aturan Aljabar Boolean

Commutative law of addition 

Commutative law of addition, 
            A+B = B+A 
the order of ORing does not matter










Commutative law of Multiplication 

Commutative law of Multiplication 
                AB = BA 
the order of ANDing does not matter.








Associative law of addition 

Associative law of addition 
            A + (B + C) = (A + B) + C 
The grouping of ORed variables does not matter








Associative law of multiplication

Associative law of multiplication 
            A(BC) = (AB)C 
The grouping of ANDed variables does not matter







Distributive Law 

        A(B + C) = AB + AC











Boolean Rules

1) A + 0 = A 
  • In math if you add 0 you have changed nothing
  • In Boolean Algebra ORing with 0 changes nothing









2) A + 1 = 1 
  • ORing with 1 must give a 1 since if any input is 1 an OR gate will give a 1










3) A • 0 = 0 
  • In math if 0 is multiplied with anything you get 0. If you AND anything with 0 you get 0 









4) A • 1 = A 
  • ANDing anything with 1 will yield the anything










5) A + A = A 
  • ORing with itself will give the same result
 









6) A + A' = 1 
  • Either A or A' must be 1 so A + A' =1











7) A • A = A 
  • ANDing with itself will give the same result










8) A • A = 0 
  • In digital Logic 1' = 0 and 0' =1, so AA' = 0 since one of the inputs must be 0.










9) A = A'
  • If you not something twice you are back to the beginning









10) A + AB = A 

Proof: 
A + AB    = A(1 +B)         DISTRIBUTIVE LAW 
                = A·1                 RULE 2: (1+B) = 1 
                = A                     RULE 4: A·1 = A 

11) A + AB = A + B 

  • If A is 1 the output is 1 , If A is 0 the output is B 

Proof: 

A + AB = (A + AB) + AB                         RULE 10 

             = (AA +AB) + AB                       RULE 7 

             = AA + AB + AA +AB                RULE 8 

             = (A + A)(A + B)                         FACTORING 

             = 1·(A + B) RULE 6 = A + B      RULE 4 

 12) (A + B)(A + C) = A + BC 

PROOF :

(A + B)(A +C) = AA + AC +AB +BC DISTRIBUTIVE LAW 

                        = A + AC + AB + BC RULE 7 

                        = A(1 + C) +AB + BC FACTORING 

                        = A.1 + AB + BC RULE 2 

                        = A(1 + B) + BC FACTORING 

                        = A.1 + BC RULE 2 

                        = A + BC RULE 4


Sumber: https://onlinelearning.uhamka.ac.id

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