Slide 60
Slide 60 text
1. {(1, x), (1, y), (2, x), (2, y), (3, x), (3, y)}
2. {(x, 1), (x, 2), (x, 3), (y, 1), (y, 2), (y, 3)}
3. {(1, x, 〇), (1, x, □), (1, y, 〇), (1, y, □), (2, x,
〇), (2, x, □), (2, y, 〇), (2, y, □), (3, x, 〇), (3, x,
□), (3, y, 〇), (3, y, □)}
4. {(1, 1), (1, 2), (1, 3), (2, 1), (2, 2), (2, 3), (3, 1),
(3, 2), (3, 3)}
5. {}
※任意の集合Aに対してA ✖ ∅ = ∅ ✖ A = ∅
59
演習:直積 答え