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Notable Question

Question with 2,500 views. This badge can be awarded multiple times.

qw3n

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earned this badge 3 times.

Using the second principle of finite induction to prove $a^n -1 = (a-1)(a^{n-1} + a^{n-2} + ... + a + 1)$ for all $n \geq 1$

Awarded Dec 1, 2021 at 18:11

The sum of the reciprocal of the triangular numbers up to $\frac1{t_n}$ is < 2

Awarded May 1, 2018 at 2:53

What is the second principle of finite induction?

Awarded May 13, 2015 at 14:17

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