--- name: metaphysics-ontology description: "Master metaphysics and ontology - the study of being, existence, and fundamental reality. Use for: existence, being, substance, identity, causation, modality, time, universals. Triggers: 'ontological', 'metaphysical', 'what exists', 'substance', 'essence', 'existence', 'being', 'identity', 'persistence', 'causation', 'modality', 'possible worlds', 'universals', 'particulars', 'properties', 'abstract objects', 'time', 'change', 'composition'." --- # Metaphysics & Ontology Skill Master the fundamental questions of metaphysics: What exists? What is being? What is the ultimate nature of reality? ## Core Questions ### Fundamental Issues | Question | Field | Examples | |----------|-------|----------| | What exists? | Ontology | Numbers? Properties? Possible worlds? | | What is being? | Fundamental ontology | Being vs. beings | | What are things made of? | Substance metaphysics | Matter, form, properties | | What makes something the same over time? | Persistence | Personal identity, ship of Theseus | | What is causation? | Causal metaphysics | Regularity, counterfactual, powers | | What is possible/necessary? | Modality | Possible worlds, essence | --- ## Ontology: What Exists? ### Ontological Categories ``` ONTOLOGICAL LANDSCAPE ═════════════════════ CONCRETE PARTICULARS ├── Physical objects (tables, planets) ├── Mental events (thoughts, pains) └── Persons ABSTRACT OBJECTS (?) ├── Numbers, sets ├── Propositions ├── Properties/universals └── Possible worlds EVENTS AND PROCESSES ├── The Battle of Waterloo ├── The melting of ice └── My walking to work FACTS AND STATES OF AFFAIRS ├── That snow is white ├── The redness of the apple └── The table's being square ``` ### Platonism vs. Nominalism **Platonism**: Abstract objects exist - Numbers exist independently of minds - Properties are real universals - Mathematical truth is discovery, not invention **Nominalism**: Only particulars exist - No abstract objects - "Redness" is just a word for similar things - Mathematical objects are useful fictions --- ## Substance and Properties ### Substance Theories **Aristotelian Substance**: - Primary substances: individual things (this horse) - Secondary substances: kinds (horse, animal) - Substances persist through change; accidents don't **Bundle Theory**: - No underlying substance - Objects = bundles of properties - Problem: What ties the bundle together? **Substratum Theory**: - Bare particulars underlie properties - Problem: What is bare substratum? Unknowable? ### Properties **Universals vs. Tropes**: | Universals | Tropes | |------------|--------| | One property, many instances | Each instance a particular | | "Redness" is one thing | This red ≠ that red | | Shared by objects | Resembling particulars | | Explains resemblance | Avoids mysterious sharing | --- ## Identity and Persistence ### Personal Identity **Theories**: ``` PERSONAL IDENTITY THEORIES ══════════════════════════ PSYCHOLOGICAL CONTINUITY ├── Memory, personality, beliefs ├── Locke: consciousness makes identity ├── Parfit: What matters isn't identity └── Problems: Fission, amnesia BIOLOGICAL CONTINUITY ├── Same organism = same person ├── Animalism (Olson) └── Problems: Transplant cases SOUL/SUBSTANCE VIEW ├── Immaterial soul persists ├── Problems: Interaction, detection └── Forensic vs. metaphysical identity ``` ### Ship of Theseus ``` SHIP OF THESEUS ═══════════════ Original ship's planks gradually replaced. Is it still the same ship? VARIANT: Old planks reassembled into second ship. Which is the original? POSITIONS: ├── Neither (no real identity) ├── Repaired ship (spatial continuity) ├── Reassembled ship (material continuity) └── Both partially (graded identity) ``` --- ## Causation ### Theories **Regularity Theory** (Hume): - Causation = constant conjunction - No necessary connection - "Cement of the universe" is just habit **Counterfactual Theory** (Lewis): - C causes E iff: If C hadn't occurred, E wouldn't have - Analyzed via possible worlds **Powers/Dispositions**: - Causes have intrinsic causal powers - Salt's solubility is real property - Not reducible to regularities **Process/Mechanism**: - Causation = physical process - Transfer of energy, momentum - Tracing causal history --- ## Modality ### Possible Worlds **Modal Claims**: - Necessarily P: P is true in all possible worlds - Possibly P: P is true in some possible world - Contingently P: P is true but could be false **What Are Possible Worlds?**: ``` POSSIBLE WORLDS REALISM ═══════════════════════ MODAL REALISM (Lewis) ├── Possible worlds are concrete realities ├── As real as actual world ├── "Actual" is indexical (like "here") └── Controversial but powerful ERSATZISM ├── Possible worlds are abstract objects ├── Sets of propositions, or ├── Maximal states of affairs └── More conservative FICTIONALISM ├── Possible worlds are useful fictions ├── No commitment to existence └── Instrumentalist reading ``` ### Essence and Necessity **Essential Properties**: Properties a thing must have to be that thing **Accidental Properties**: Properties a thing happens to have **Kripkean Essentialism**: - Origin is essential (you couldn't have different parents) - Natural kinds have essences (water = H₂O necessarily) - Names are rigid designators --- ## Time ### Theories of Time **A-Theory (Tensed)**: - Past, present, future are real - Present is metaphysically special - Time flows **B-Theory (Tenseless)**: - Only earlier-than, simultaneous, later-than relations - No privileged present - "Block universe" — all times equally real ### Persistence Through Time **Endurantism**: Objects are wholly present at each moment **Perdurantism**: Objects have temporal parts (stages) ``` PERSISTENCE VIEWS ═════════════════ ENDURANTISM PERDURANTISM ├── Object wholly ├── Object has temporal parts │ present at each time │ (like spatial parts) ├── Properties change ├── Different stages have │ (intrinsic change) │ different properties └── Intuitive but └── Handles change better but faces puzzles counterintuitive ``` --- ## Composition ### The Special Composition Question When do parts compose a whole? **Universalism**: Any objects compose something **Nihilism**: No composite objects exist **Restricted**: Some conditions required (contact, life, etc.) ### Mereology - Part-whole relations - Proper vs. improper parts - Transitivity of parthood - Supplementation principles --- ## Key Vocabulary | Term | Meaning | |------|---------| | Ontology | Study of what exists | | Metaphysics | Study of fundamental nature of reality | | Substance | What exists in itself | | Property | What is attributed to substance | | Universal | One thing shared by many | | Particular | Individual, unrepeatable | | Trope | Particular instance of property | | Modal | Concerning possibility/necessity | | A priori | Independent of experience | | A posteriori | Dependent on experience | | Essence | What makes thing what it is | | Accident | What thing contingently has | | Supervenience | No A-difference without B-difference | | Haecceity | Thisness; individual essence | --- ## Integration with Repository ### Related Themes - `thoughts/existence/`: Being, reality, metaphysics ### Thought Experiments - Ship of Theseus - Teletransporter - Twin Earth (for natural kinds)