Recent content by anon1980_1@hotmail.c

  1. A

    Proof: A, B, and C Sets | A Union B Subset of C

    How can I clarify the next to last line? Someone please offer me suggestions?
  2. A

    Proof: A, B, and C Sets | A Union B Subset of C

    Can I just assume that A is contained in A union B which is contained in C? The way I have written my proof is the way we were taught in class. Does it make sense? Or are there obvious flaws in the logic?
  3. A

    Proof: A, B, and C Sets | A Union B Subset of C

    Suppose A, B, and C are sets. Prove that if A union B is a subset of C, then A is a subset of C and B is a subset of C. My proof: Suppose A, B, and C are sets such that A union B is a subset of C. Then for all x, if x is in A union B, then x is in C. Since x is in A union B, this means x...
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