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Find the Error in the Following Proof of This "Theorem n=n+1' n = n + 1 '

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Find the error in the following proof of this "theorem":
"Theorem: Every positive integer equals the next largest positive integer."
"Proof: Let P(n) be the proposition n=n+1' n = n + 1 '
To show that P(k)P(k+1)P ( k ) \rightarrow P ( k + 1 ) assume that P(k) is true for some k , so that k=k+1 . Add 1 to both sides of this equation to obtain k+1=k+2 , which is P(k+1) . Therefore P(k)P(k+1)P ( k ) \rightarrow P ( k + 1 ) is true. Hence P(n) is true for all positive integers n . "


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