Question

Evaluate the following expressions:

a) 6 * 3 + 4**2 // 5 – 8

b) 10 > 5 and 7 > 12 or not 18 > 3
​

Answer 1

Explanation:

usual, prove it using the general heuristic that

X=YX=Y if and only if X⊆Y and X⊇Y.X⊆Y and X⊇Y.

In other words, take a generic element of A×(B−C)A×(B−C) and show that it also must be an element of (A×B)−(A×C)(A×B)−(A×C), and vice versa.