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In the summer of 1994, I was teaching first semester Calculus for the first time. When we got to the applications of deriviatives, we talked about critical numbers being the potential relative extrema and identified them as points where f'(x)=0 or f'(x) is undefined. In the very next section, we came across possible inflection points that consisted of points where f"(x)=0 or f"(x) is undefined. I was surprised to see that there was no name for these points. So, I began calling them Hergert Numbers.
In the years that followed, I taught the course many, many times. Each semester I would refer to these points as the Hergert Numbers, yet the term just didn't seem to be catching on - until now. In March 2009, a movement was started to help popularize the term.
It began with t-shirts:
Moved to driveway art:
And now the Hergert Numbers movement is gaining momentum:
There are even frisbees promoting the Hergert Numbers hanging in the hallways of Rock Valley College:
During the summer of 2009, Rachel Swaney took the Hergert Numbers movement international. Here she is wearing her Hergert Numbers t-shirt on the streets of China.
Next, we see how the Chinese feel about the Hergert Numbers.
By August of 2009, the Hergert Numbers craze had spread to the Meena family reunion.
The Hergert Numbers are turning Sin City into f(x)=Sin(x) City
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