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प्रश्न
Find A × B, A × A and B × A:
A = {m, n}; B = Φ
उत्तर
A = {m, n}; B = Φ
Note: B = Φ or { }
A × B = {m, n} × { }
= { }
A × A = {(m, n) × (m, n)}
= {(m, m) (m, n) (n, m) (n, n)}
B × A = { } × {m, n}
= { }
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