O Sweet Mr Math

wherein is detailed Matt's experiences as he tries to figure out what to do with his life. Right now, that means lots of thinking about math.

Saturday, February 04, 2012

2:09 PM

Just like we can define multiplication as repeated addition, we can define exponentiation as repeated multiplication. Exponentiation doesn't have the same properties as addition and multiplication, but it does have some worth mentioning, which again we can prove are true based on the definition. It does have closure on the natural numbers, so an is always a natural number if a and n are natural numbers. It is not commutative or associative (in general, an≠na), but it is true that am+n=aman, which feels to me like the distributive law for multiplication and addition. Also, (am)n=amn, which follows from the previous property.

Another property the natural numbers have is that they are ordered. a>b is defined to mean that there exists a natural number n such that a=b+n. This means that for any two numbers, there are three possibilities: they are equal, the first is greater, or the second is greater. The fact that one and only one of these three cases is true is used all the time in proofs. It also means that if a>b and b>c, a must be greater than c. Which means that for any set of natural numbers, it is always possible to order them from smallest to largest.




What does "rolls a hoover" mean, anyway?

"Roll a hoover" was coined by Christopher Locke, aka RageBoy (not worksafe). He enumerated some Hooverian Principles, but that might not be too helpful. My interpretation is that rolling a hoover means doing something that you know is stupid without any clear sense of what the outcome will be, just to see what will happen. In my case, I quit my job in an uncertain economy to try to start a business. I'm still not sure how that will work out.

Why is the HTML for this page not valid?

BlogSpot adds the advertisement that appears at the top of this page. That advertisement is not valid HTML and is outside of my control. I believe that aside from that ad, this page is valid HTML.