Discrete Mathematics, Mathematics, Mathematics Education, Study Guide, Computer Science.
represents the number zero. c. How many elements are in the set {1, {1}}? solution: The set {1, {1}} has two elements: 1 and the set whose only element is 1. d. For each nonnegative integer n, let ∪n= {n, −n}. Find ∪1, ∪2, and ∪0. solution: ∪1= {1, −1}, ∪2= {2, −2}, ∪0= {0, −0} = {0, 0} = {0}.