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* Question for discrete math:functions,recurrence relation

  1. Jun 24, 2009 #1
    a) Let f:N*N->Q be defined by f(m,n)=(m-3)/n. Determine if f is injective or surjective.

    b) Show that if f:A->B and g:B->C are both bijective, then the composition (g o f):A->c is also bijective.

    Solve the recurrence relations

    a(r)-5a(r-1)+6a(r-2)=2^r+r
    (r,r-1,r-2 are all subscripts)
     
  2. jcsd
  3. Jun 25, 2009 #2
    Since this is a "no homework" forum, you should ask again in the "homework" forum.
     
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