Agent-Skills.md

Agent Skills: Metaphysics & Ontology Skill

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'.

UncategorizedID: chrislemke/stoffy/metaphysics-ontology

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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)