$x' = 1 \ne 0.$
Statement: For any integer
Proof
Base Case: For
Induction hypothesis: Assume that for some for all
Induction step: Consider . Note that
Using product rule,
By induction hypothesis, and . Therefore, . So the result holds by induction
I know this statement is obviously false, but I can't seem to find anything wrong with the proof that is provided.
I looked through my notes and it looks like every step of the induction process is followed correctly.
Can someone please help me figure out which part is wrong? or give me a hint?
Upon reflection, my post above is too curt.
When you show that $(x^0)' = 0$ you have proved that
$the\ set\ J\ such\ that\ i \in J \implies i \in \mathbb Z\ and\ i \ge 0\ and\ (x^i)' = 0\ is\ not\ empty.$
Thus I dislike the traditional phraseology "$Assume\ for\ some\ integer\ k \ge 0\ that\ (x^k)' = 0."$
You have proved that J contains at least one such integer. So I prefer to say, "Let k be any member of J." But you have not proved that 1 is in set J, and so (x^{1})' = 0 is not permissible (as well as being false).
Hint: what happens for k = 1?
A variation of this proof is used to prove that all horses are the same color. Basically, you are using the wrong base case.
This step does not work for k= 0 because you are using " before you have proved it.
Therefore, . So the result holds by induction
I know this statement is obviously false, but I can't seem to find anything wrong with the proof that is provided.
I looked through my notes and it looks like every step of the induction process is followed correctly.
Can someone please help me figure out which part is wrong? or give me a hint?