Discussion
Which Boolean law states A + 0 = A ?
Answer: A
A + 0 = A is the identity law.
The identity laws say that ORing a variable with 0, or ANDing it with 1, leaves it unchanged: A + 0 = A and A · 1 = A. 0 is the identity element for OR, as 1 is for AND.
The annulment (null) laws are A + 1 = 1 and A · 0 = 0. The complement laws are A + A' = 1 and A · A' = 0. The idempotent laws are A + A = A and A · A = A.
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