untagged-8d409849a87c2de95cde: finished chapter "m for mass"

- finished chapter "m for mass"
- corrections by the study questions

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Added Purpose and Acknowledgements

untagged-492422c0dfffabc738cf: New context and preface

- context
- preface
- new order
- paragraph style changed
- added @cgsell as contributor

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character-list, not complete

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character-list test

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LaTeX syntax correction

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typos

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write chapter 13, 14 and 16

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First draft chapter equals symbol

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finished all my chapters