Preface 7
Chapter I: Lives and Works of Oxford Calculators (Elżbieta Jung) 11
1. Richard Kilvington 13
2. Thomas Bradwardine 18
3. William Heytesbury 20
4. The Anonymous Author of the De sex inconvenientibus 22
5. John Dumbleton 29
6. Richard Swineshead 31
Chapter II: Theories of Local Motion before the Oxford Calculators (Elżbieta Jung) 37
1. Aristotle’s “Mathematical Physics” 37
2. Theories of Motion in Arabic Medieval Philosophy 43
3. The English Tradition in Mathematical Natural Science 50
Chapter III: Oxford Calculators on Local Motion (Elżbieta Jung, Robert Podkoński) 57
1. Richard Kilvington’s Theory of Local Motion 57
1.1. Motion with respect to its Causes 58
1.1.1. An Excess of Acting Power over Resistance – the Condition Necessary for Motion 59
1.1.2. Inalienable Conditions of Motion 61
1.1.2a. How to “Measure” an Active Power? 63
1.1.2b. How to “Measure” a Passive Power? 65
1.1.3. The Result of Action of Powers – Speed of Motion 67
1.2. Motion with respect to its Effect – the Distances Traversed and Time 79
2. Thomas Bradwardine’s Treatise on Local Motion 82
3. William Heytesbury’s Contribution to the Oxford Calculators’ Science of Local Motion 87
4. The Theory of Motion in the Anonymous Treatise: De sex inconvenientibus 93
4.1. The Causes of Accelerated Motion 99
4.2. The Motion of a Sphere 101
4.3. The Mean Speed Theorem 104
5. John Dumbleton on Local Motion 112
5.1. The Mean Speed Theorem 124
6. Richard Swineshead’s Speculative Science of Local Motion 125
Chapter IV: Towards Modern Mechanics? (Elżbieta Jung, Robert Podkoński) 159
The Novelty of Medieval Mechanics vis-à-vis Aristotelian and Galileian Theories… 184
Editions 189
Introduction (Elżbieta Jung, Joanna Papiernik, Robert Podkoński) 191
1. Richard Kilvington’s Question Utrum potentia motoris excedit potentiam rei motae from His Quaestiones super libros Physicorum 192
2. The Section De motu locali of William Heytesbury’s Regulae solvendi sphismata 193
3. The Question Utrum in motu locali sit in certa servanda velocitas from the Anonymous Treatise de sex inconvenientibus 201
4. Selected Fragments of Part III: De motu locali of John Dumbleton’s Summa logicae et philosophiae naturalis 204
5. Presentation of the Texts – Editorial Rules, the Contents of apparati critici, and Abbreviations Used 207
5.1. Richard Kilvington, Utrum in omni motu potentia motoris excedit potentiam rei motae 208
5.2. William Heytesbury, De motu locali 209
5.3. Anonymous, Utrum in motu locali sit certa servanda velocitas 210
5.4. John Dumbleton, De motu locali 210
Ricardus Kilvington, Utrum in omni motu potentia motoris excedit potentiam rei motae, Elżbieta Jung (ed.) 213
Guilelmus Heytesbury, De motu locali, Elżbieta Jung, Robert Podkoński (eds) 267
Anonimus, Utrum in motu locali sit certa servanda velocitas, Joanna Papiernik (ed.) 297
Johannes Dumbleton, De motu locali, Elżbieta Jung, Robert Podkoński (eds) 391
Bibliography 427
Index of Names 447
Summary 451
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