1. The document discusses simplification of Sum of Products (SoP) expressions using Karnaugh maps. It provides two examples of SoP expressions and their simplification using K-maps.
2. The first example simplifies the expression A'B'C'+A'B'C+ABC'+AB'C' to AB+AC using a 4-variable K-map.
3. The second example simplifies the expression B'C'+AB'+ABC'+AB'CD'+A'B'C'D+AB'CD to AB'C'D+AB'C'D'+A'B'C'D+A'B'C'D'+AB'