## A Funny Spoof Video By Teachers

This is an old video I came across with in Youtube. Funny but true at times (at least for me). This video appeared Jimmy Kimmel video from National Teacher’s Day in 2012.

What do you think?

## The 3 Saddest Mathematics Love Stories

There are many unfortunate events in mathematics as well as the lives of mathematicians. You haven’t probably heard the misfortunes of Evariste Galois; he died at the age of 20 in a duel for a lady who didn’t love him.You probably know some famous theorems by great mathematicians, but you probably didn’t know that they died young.  You probably do not know that Descartes could not marry either of the two woman he loves because they were on different social status.

But despite these unimaginable events, there are actually untold stories that history failed to acknowledge. I think they are probably the 3 saddest mathematics love stories ever told. Now, don’t be depressed.

The 3 Saddest Mathematics Love Stories

1. Tangent lines who had one chance to meet and then parted forever.

2. Parallel Lines who were never meant to meet.

3. Asymptotes who can get closer and closer to each other but will never be together.

Source: Unknown (I saw this in Facebook).

## Domain and Range 1: Basic Concepts

Domain and range are concepts that are essential in learning functions.  In most resources, these concepts are just defined technically, and although there are examples, many just lack intuitive explanations. In this post, we discuss domain and range in a simple and hopefully easy to understand manner.

Example 1: $f(x) = 2x + 1$

Domain

What is the domain of $f(x) = 2x + 1$ and what is its range? Well, the domain are just the possible values of $x$ that will produce a “valid” value $f(x)$. To check, we can ask the following questions.

• Can we substitute positive values to $x$?
• Can we substitute negative values to $x$?
• Can we substitute 0 to $x$?

Obviously, the answer to these questions are all yes. In fact, we can assign any real number value to $x$ and we can always get a corresponding value for $f(x)$. » Read more