Control theory tutorial files:

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00_readme.txt:  this file

ControlTutorial-1.0.0.pdf: Free e-book, published by Springer

mmaControlTutorial-1.0.0.nb: Mathematica notebook file

mmaControlTutorial-1.0.0.m:  Mathematica m-file

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The software code was developed with Mathematica version 11.2, see http://www.wolfram.com/mathematica/. 

Mathematica is a commercial product that requires a paid license. A free reader program is available that allows one to view Mathematica notebooks and embedded graphics. See https://www.wolfram.com/cdf-player/.

The file with extension .nb is a Mathematica notebook. That notebook includes embedded graphics for most of the figures generated in the manuscript. Because of the graphics, it is a large file. The file with extension .m is a Mathematica m-file. That file does not contain graphics and is much smaller. The m-file can be imported into a notebook file for use. 

The free reader program should open the .nb file for viewing, but will not run any code. The free reader program may not open the .m file, which may require a paid licensed version of the software.