Discrete mathematics Student:Bilura Kurbanova

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Across
  1. 4. relation f-¹ is a function from B to A
  2. 6. declarative statement which is true or false, but not both
  3. 7. sybol is the Greek letter sigma. Consider a sequence a1, a2, a3,...
  4. 8. (U ∩ A) ∪ (B ∩ A) = A is (∅ ∪ A) ∩ (B ∪ A) = A
  5. 9. denoted by A ∪ B, is the set of all elements which belong to A or to B
  6. 10. Any two propositions can be combined by the word “and" p^q
Down
  1. 1. A = {1, 2}, B = {4, 5, 6}, and C = {5, 6, 7, 8} They dont have common elements
  2. 2. product of A and B n(A × B) = n(A) · n(B)
  3. 3. p↔ q is true whenever p and q have the same truth values and false otherwise
  4. 5. denoted by A\B,is the set of elements which belong to A but which do not belong to B