Prove or find a counter example of : 3 divide 22n−1 for all n∈N.
I compute 22n−1 until n=5 and it looks to work, but how can I prove this ? I tried by contradiction, but impossible to conclude. Any idea ?
I have injection f:A→B and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...
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