Which of the following statements is not true?
?
A. If A? B, r is the cardinality of A and s is the cardinality of B, then s< r.
B. ?If A? B, r is the cardinality of A and s is the cardinality of B, then r< s.
C. ?If r< s, then r - s< 0.
D. a and b are true.
E. ?None of the above.
Answer: A
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, 
, and 
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?
?
A. -1; scalar
B. 
; vector
C. 
; vector
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A. 
B. 
C. 
D. 