Click Below to see Fry Readability test results. These results open in Word. The first sample is off the charts. It appears that the Fry program did not know what to do with it, or it was so advanced that it is unmeasureable. This sample included several mathematical formulas, so I am not surprised that there were problems measuring readability.
The second sample measured at the college freshman level. Again, I am not surprised. Reading a math book is entirely different than reading any other kind of text. The readability is difficult because so many concepts and symbols are packed into a few lines.