week3

This week I learned something about conjunction and disjunction, implication and negation. Conjunction means ‘and’, and we can consider it as ‘intersection’ in the set. Disjunction means ‘or’, and we can consider it as ‘union’ in the set. This part is not difficult to understand. The toughest part may be the negation.However, negation has some rules. For example, the negation of ‘∃ a∈A, …’ is ‘∀ a∈A, ¬…’. On the weekend, my friends and I finished the assignment1. It is not too hard to solve, but it took us much time. How to write the negation of the statement in English or symbolic form needed us to do a lot works. Some questions are easy with drawing Venn diagram. Csc165 is really an interesting course.