In a line of falling dominoes, each domino has the same experience as the one before it. It is hit, it falls over, and it hits another. In an infinite line of dominoes, only the first one has a unique experience. If we can prove that the first domino will fall, and then prove that any domino will cause the one following it to fall, we can conclude that tipping the first domino will start an endless sequence of falling dominoes.

These, in fact, are the three steps of mathematical induction!

If we suspect that a particular condition is true for an endless sequence of steps, for example, we simply:

1. prove that it is true for some starting step, then

2. prove that, ** if** it is true for any subsequent step,

3. conclude that it is true for all steps from the first one.

As you can see, we count in the same way. We choose a place to start and then keep adding one. With mathematical induction, the steps do not have to be one unit apart.

It is important to understand that mathematical induction is not the same as inductive reasoning. *Inductive reasoning* is not a ** proof** of anything. It is simply drawing/inferring conclusions from a collection of data.

*Please note that I could not find any copyright message associated with the above image, but would like to thank Mark Wibrow for using TikZ Code to create it. It was very appropriate for this topic.
*

That is terrific. I really like how you have a common theme of your length × breadth through your teaching. As a fellow maths teacher I’m very into that idea. Thumbs up 🙂

Chris M (on CCM YouTube video about Simpson’s Rule)

See all Testimonials