Hello, Can anyone help me on this question please ? Prove that if |A| ≤ |B| and |B| ≤ |C| then |A| ≤ |C|
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Originally Posted by Jessica.M Hello, Can anyone help me on this question please ? Prove that if |A| ≤ |B| and |B| ≤ |C| then |A| ≤ |C| There are injections: $\displaystyle \phi: A\mapsto B \mbox{ and }\psi : B\mapsto C$. Hint: $\displaystyle \psi \circ \phi : A\mapsto C$.
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