### BAD::5 April 2006 (Counting)

`5 April 2006` written in `MM/DD/YY` format is `04/05/06` and this date demonstrates counting.

`04/05/06` also demonstrates increment-by-one: four incremented-by-one is five and five incremented-by-one is six.

The average of `4` and `6` is `5`.

```   (4 + 6)    10
------- = ---- = 5
2        2
```

Thanks to SCC professor Dueck (and MarkP and KevinO and the Arizona Republic's Clay Thompson and MaryF) for the following time and date tidbit.

```   At two minutes and three seconds after 1:00
am and pm, the time and date were:

01:02:03 04/05/06
```

I'm more use to using date and time rather than time and date.

```   At eight minutes and nine seconds after 7:00
am and pm, the date and time were:

04/05/06 07:08:09

What goes up must go down?

At five minutes and four seconds after 6:00
am and pm, the date and time were:

04/05/06 06:05:04
```

More off the wall arithmetic analysis with 04/05/06...

```   (1) summation(4, 6) = 5

(2) summation[4, 6] = 4 + 5 + 6 = 15
15 is a "multiple" of 5

(3) 4 + 6 = 10
5 is a "factor" of 10
```
##### Quickie About Interval Notation

Note: This BAB used the `summation` function to demonstrate interval notation. Interval notation is used to represent a set of numbers.

```   Assume we have a value and two numbers 'n' and 'm'
where 'n' is less than 'm'.

[n, m]   n <= value <= m
[n, m)   n <= value < m
(n, m]   n < value <= m
(n, m)   n < value < m

[] imply inclusive
() imply exclusive
```

Creator: Gerald D. Thurman [gthurman@gmail.com]
Created: 05 April 2006

This work is licensed under a Creative Commons License.