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This step is not the source of the fallacy.

This step is simply stating what happens in an induction argument.

The principle of induction says that, if the following two things are true

  1. S(1) is true, and
  2. For all natural numbers k: if S(k) is true, so is S(k+1),
then S(n) is true for all n. (For more details, see the brief summary of induction).

This step in the proof is simply asserting that part 1 above has already been proven (this follows from step 2), and that therefore proving part 2 is enough to prove that S(n) is true for all n.

Why don't you go back to the list of steps in the proof and see if you can identify which one is wrong, now that you know it isn't this one?
This page last updated: May 26, 1998
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