Final answer:
The expression for the Absorption law is A + AB = A, which simplifies logical expressions in boolean algebra by stating that the presence of A alone is enough to satisfy the expression, regardless of B.
Step-by-step explanation:
The expression for Absorption law in logic and mathematics is A + AB = A. This law is used in boolean algebra and simplifies expressions where a term is ORed with itself multiplied by another term. The concept is that if A is true, then the result is A, regardless of the value of B.
For example, if we're looking at a set of logical items, and A represents a certain item being present, then whether or not B is present doesn't matter; the presence of A alone is enough to satisfy the expression A + AB.