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00-Preface.ipynb: missing space

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00-Preface.ipynb
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@ -359,7 +359,7 @@
"\n",
"As I began to understand the math and theory more difficulties appeared. A book or paper will make some statement of fact and presents a graph as proof. Unfortunately, why the statement is true is not clear to me, or I cannot reproduce the plot. Or maybe I wonder \"is this true if R=0?\" Or the author provides pseudocode at such a high level that the implementation is not obvious. Some books offer Matlab code, but I do not have a license to that expensive package. Finally, many books end each chapter with many useful exercises. Exercises which you need to understand if you want to implement Kalman filters for yourself, but exercises with no answers. If you are using the book in a classroom, perhaps this is okay, but it is terrible for the independent reader. I loathe that an author withholds information from me, presumably to avoid 'cheating' by the student in the classroom.\n",
"\n",
"All of this impedes learning.I want to track an image on a screen, or write some code for my Arduino project. I want to know how the plots in the book are made, and to choose different parameters than the author chose. I want to run simulations. I want to inject more noise into the signal and see how a filter performs. There are thousands of opportunities for using Kalman filters in everyday code, and yet this fairly straightforward topic is the provenance of rocket scientists and academics.\n",
"All of this impedes learning. I want to track an image on a screen, or write some code for my Arduino project. I want to know how the plots in the book are made, and to choose different parameters than the author chose. I want to run simulations. I want to inject more noise into the signal and see how a filter performs. There are thousands of opportunities for using Kalman filters in everyday code, and yet this fairly straightforward topic is the provenance of rocket scientists and academics.\n",
"\n",
"I wrote this book to address all of those needs. This is not the sole book for you if you design military radars. Go get a Masters or PhD at a great STEM school, because you'll need it. This book is for the hobbyist, the curious, and the working engineer that needs to filter or smooth data. If you are a hobbyist this book should provide everything you need. If you are serious about Kalman filters you'll need more. My intention is to introduce enough of the concepts and mathematics to make the textbooks and papers approachable.\n",
"\n",