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Is the first mathematical induction the same as the second mathematical induction? When to use the first mathematical induction and when to use the second mathematical induction?
The first mathematical induction: ① verify that the proposition is correct when n= 1; ② Suppose n = 2；; ③ Prove that n = k+1; This proposition is correct.
The second mathematical induction: ① verify that the proposition is correct when n= 1 and n=2; ② Hypothesis n
For example, proving DN = 3 (n+ 1)-2 (n+ 1) requires a second mathematical induction.