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The Subject
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Homework Statement
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Show that the statement holds for all positive integers n
2n ≤ 2^n
Homework Equations
Axiom of induction:
1 ∈ S and
k ∈ S ⇒ k + 1 ∈ S
The Attempt at a Solution
Let S be set of integers
2(1) ≤ 2^1, so S contains 1
k ∈ S,
2k ≤ 2^k
I want to show k + 1 ∈ S,
2k + 2(k+1) ≤ 2^k * 2^(k+1)
The left side seems to make sense since
=2k+2k+2
=4k+2
=2(k+1)
I showed k + 1 ∈ S
The right side i get
=2^(k(k+1))
Does this show k + 1 ∈ S ? To me 2k*2(k+1) makes sense because the next value of k can be calculated ?