| Contents | 6 |
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| Preface | 12 |
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| Abbreviations for works of Hermann Grassmann | 18 |
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| On the lives of the Grassmann brothers | 22 |
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| Description of the life of Hermann Grassmann by his son Justus Grassmann, probably written shortly after the death of his father, 1877 | 24 |
| Life history of Robert Grassmann, written by himself (1890) | 29 |
| Historical contexts of Hermann Grassmann's creativity | 36 |
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| Discovering Robert Grassmann (1815–1901) | 37 |
| An overlooked prolific polymath | 37 |
| Plan of the paper | 38 |
| Books by the score | 38 |
| Before GW: Robert's Wissenschaftslehre | 40 |
| The first planned version of GW | 43 |
| The house that Robert Grassmann built: the structure and chronology of GW | 43 |
| Some characteristics of GW | 47 |
| Robert Grassmann on the calculus and logic | 49 |
| Four final queries | 51 |
| Acknowledgements | 51 |
| 53 | 51 |
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| Hermann Grassmann's theory of religion and faith | 54 |
| I | 54 |
| II | 55 |
| Why have people stopped believing in miracles? | 56 |
| Where does the knowledge of mankind come from? | 57 |
| Where do we find absolute knowledge? | 58 |
| Is the Bible the absolute word? | 59 |
| Who interprets scripture? | 61 |
| III | 62 |
| The Significance of Naturphilosophie for Justus and Hermann Grassmann | 65 |
| The philosophy of Christian Samuel Weiss | 67 |
| Emergence of matter | 68 |
| Concept of extension | 70 |
| The question of influence | 74 |
| Justus and Hermann Grassmann: philosophy and mathematics | 76 |
| Institutional development of science in Stettin in the first half of the nineteenth century in the time of Hermann Grassmann | 86 |
| Pomerania at the turn of the nineteenth century | 86 |
| The time of the Bourgeois reformers | 88 |
| Johann August Sack: governor and reformer in Pomerania | 89 |
| Stettin and its Marienstift Gymnasium | 90 |
| The Pommersche Provinzial: Blätter für Stadt und Land 1820–1825 | 91 |
| The founding of the ``Society for Pomeranian History and Classical Studies'' | 94 |
| The establishment of the Stettin Provincial Archives | 95 |
| The flowering of scientific life in Stettin | 96 |
| Philosophical and methodological aspects of the work of the Grassmann brothers | 99 |
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| Brief outline of a history of the genetic method in the development of the deductive sciences | 100 |
| I | 100 |
| II | 101 |
| III | 102 |
| IV | 102 |
| V | 103 |
| VI | 103 |
| VII | 103 |
| Grassmann's epistemology: multiplication and constructivism | 104 |
| Introduction | 104 |
| The product between extensive magnitudes | 105 |
| Extensive magnitudes | 106 |
| The product between extensive magnitudes | 107 |
| A comparative philosophical analysis | 108 |
| The product between vectors and multivectors | 109 |
| Domain and homogeneity | 110 |
| Conclusion | 111 |
| Axiomatics and self-reference Reflections about Hermann Grassmann's contribution to axiomatics | 114 |
| The (never ending?) debate | 114 |
| The place of axiomatics in the Lehrbuch der Arithmetik (1861): the positions of Gottlob Frege, Judson Webb, and Hao Wang | 116 |
| Hans-Joachim Petsche's interpretation | 120 |
| An alternative interpretation: axiomatics and self-reference | 122 |
| Instead of a conclusion | 128 |
| Concepts and contrasts: Hermann Grassmann and Bernard Bolzano | 130 |
| Introduction | 130 |
| Some parallels of context | 131 |
| Some divergences of working | 133 |
| The nature and classification of mathematics | 134 |
| What shall we do with geometry? | 136 |
| What makes a Presentation ``Scientific''? | 137 |
| Conclusion | 139 |
| Diversity of the influence of the Grassmann brothers | 141 |
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| New forms of science and new sciences of form: On the non-mathematical reception of Grassmann's work | 142 |
| Grassmann outside mathematics | 142 |
| Grassmann in psychology and physiology | 143 |
| Basic structures and operations: relations, order and abstraction | <