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Negative Information

Some of the statements may give negative information (for example, A is not a brother of B). Though negative information does not give any hint about the relationship, it provides a clue to eliminate a possibility.

The USI and negative information are supplementary data which help us to come to a definite conclusion.

Use of Symbols to Denote Relationship

Sometimes symbols are used to represent a relationship.
 
For example, consider the following statements.
  1. A + B + C
  2. A × B × C
  3. A × B + C
  4. A - B D C
where, A + B means A is the mother of B.
 
A − B means A is the brother of B.
 
A × B means A is the sister of B.
 
A Δ B means A is the wife of B.

In the first statement, A is the mother of B and B is the mother of C. It is obvious that A is the grandmother of C.
 
In the second statement, A is the sister of B who is the sister of C. Clearly A is the sister of C.
 
In the third statement, A is the sister of B who is the mother of C. This implies that A is the aunt of C.
 
In the fourth statement, A is the brother of B, who is the wife of C. So, A is the brother-in-law of C.





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