ELI5: Explain Like I'm 5

Leibniz harmonic triangle

Okay kiddo, have you ever counted with your fingers before? Well, imagine that instead of using your fingers, we can put a bunch of numbers together in a special way to make a triangle. That's what the Leibniz Harmonic Triangle is all about!

In this triangle, each row starts and ends with 1. The numbers in between are all calculated by adding up the reciprocals (or 1 over the number) of the numbers in the row above them. So, for example, the second row has a 2 in the middle because 1/2 + 1/2 equals 1.

Now, the really cool thing about this triangle is that it shows us a pattern for adding up fractions! If we add up the numbers in each row, the sum is always 2. So, for example, in the third row, we have 1 + 1/2 + 1/3 + 1/2 + 1 = 2.

But wait, there's more! This triangle also helps us find something called "harmonic means." That's a fancy way of saying that it helps us find the middle value between two numbers. For example, if we want to find the harmonic mean between 1 and 2, we just look at the row in the triangle that has 1/2 and 1/3, and add them up to get 5/6. Ta-da!

So, to sum it all up, the Leibniz Harmonic Triangle is a special triangle made by adding up reciprocals of numbers. It shows us a pattern for adding up fractions and helps us find harmonic means. Pretty neat, huh?
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