Question

Which of the following sets Sj, (j = 1,...,4) are NOT a neighbor- hood of the given point a. (1) S = (-2,3), a=1; (2) S2 = [-3,0), a = 2. (3) S3 = {2: 2 -11 2}, a=1. (b) Let a > 0. ​

Answer 1

Answer:

The number of arrows,I.e.,the number of elements in cartesian product (A1 ×B1) of the sets A1 and B1 is - ×- and the number of relations is 2 ^ 2.