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There are several different
methods for proving things in math. One type you've probably
already seen is the "two column" proofs you did in Geometry.
In the Algebra world, mathematical
induction is the first one you usually learn because it's just a set
list of steps you work through. This makes it easier than the
other methods. There's only one semi-obnoxious step (the main
one!) But, I've got a great way to work through it that makes
it a LOT easier. I was going to start out by officially
stating "The Principle of Mathematical Induction"... But,
writing it out on my rough draft even gave ME a headache! So,
I'm just going to write out the steps... Go ahead and read
them through... But, don't expect to understand anything yet.
I'm going to explain how the whole thing works after. It
really isn't that bad.
The four steps of math induction:
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Show |
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is true |

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Assume |
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is true |

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Show |
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* In math, the arrow
means "implies" or "leads to."

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End the proof |
![Write "Thus, P( n ) is true." []](images/09-sequences-and-series-12.gif)
This is the modern way to end
a proof.
The third step is
the only tricky part... And it's the most important
step... You have to show EVERY little detail!
Remember that you are proving something -- which means that you
have to spell out your entire argument. I call this a
"monkey proof." You have to write it out soooo clearly
that the average intelligent monkey can read it through and not
get confused. Teachers are very hip to the fact that
omitting details or skipping steps on these is, probably, clueless
fudging on your part.
OK, I promised
that I would actually explain this thing to you, didn't I?
Take a minute and go back to read the steps again. I'll
wait.
Don't worry.
I didn't understand it at first either. Lucky for you,
I'm going to explain it so you WILL get it!
Continued on the
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