ehrenfest
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The first time I encountered xi was in a differential equations lecture. At first I just stared at it confused, I was going to ask what that weird character was but didn't for fear of looking silly (I was the only freshman in the class), so I finally collected myself and made some attempts to write it down. I erased and rewrote it about five times and then tried to focus back on the lecture. I noticed that several more xis had a appeared so again it took several attempts to write all of them down. By then I was trailing far behind in the proof of the theorem, so I decided to transcribe the xis on the board as English "z"s in my notes. This worked for a while until the professor introduced z as something else. So then I went back to writing the xis...
At the end of the class, the proof became an incomprehensible entanglement of xis and zs in my notes and in my head.
At the end of the class, the proof became an incomprehensible entanglement of xis and zs in my notes and in my head.