Many of you know that I started riding a unicycle about two years ago. I didn't want to make the claim that I could really ride a unicycle until I could pass the first skill level as defined by the Unicycling Society of America. One way to get certified is to record yourself and have an examiner verify that you have indeed performed the required skills.
For this level, the requirements are to mount the unicycle unassisted, ride 50 meters, and dismount gracefully with the unicycle in front of you. I've been able to ride the 50 meters for about a year and a half without difficulty. The dismount has taken a little concentration since I got into the habit of stepping off forward rather than backward when I was done. But that was just a matter of paying attention to how I finished and wasn't a big deal. The mounting unassisted part has come much more slowly. Over the past several weeks, I was finally able to do it fairly consistently and was ready to make my video.
For certification, I posted a raw video, but here's a spruced up version that I hope you'll enjoy. And, of course, I couldn't do something like this wearing just any old shirt. If you have video of yourself doing something entertaining in your Hergert Numbers shirt, please share!
In the summer of 1994, I was teaching Calculus for the first time. When we got to the applications of derivatives, 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.
Help spread the word!
If you would like your own Hergert Numbers t-shirt, email me at Rodger (at) hergertnumbers (dot) org and I'll hook you up. Once you have your shirt, get your picture taken in an interesting place or with an interesting person and I'll add you to the page.