Chapter 1: THE SCHEMATISM OF THE PURE CONCEPTS OF UNDERSTANDING (p. 180)

• In all subsumptions under a concept, the representation must be homogeneous with the concept.
• But pure concepts of understanding can never be met with any intuition.
• Transcendental Schema: mediating principle between category and appearances.
  • Must be pure and yet sensible.
• The application of the category to appearances becomes possible by means of the transcendental determination of time.
  • Which is the schema of the concepts of understanding.
  • Mediates the subsumption of appearances under the category.
• The schema is always a product of imagination.
  • Makes images possible.
  • Images are products of the empirical faculty of reproductive imagination.
• There is a schema for each category.
  • Magnitude: generation of time itself in the successive apprehension of an object. Also defined as number.
  • Quality: the filling of time.
    • Reality: sensation in general; points to being (in time).
    • Negation: not-being in time.
  • Relation: the connecting of perceptions at all times according to a rule of time determination.
    • Substance: permanence of the real in time.
    • Cause: the real which something else always follows.
      • Community: the coexistence, according to a universal rule, of the determinations of one substance with those of another.
  • Modality: time itself as the correlate of the determination whether and how an object belongs to time.
    • Possibility: the agreement of the synthesis of different representations with the conditions of time in general.
    • Actuality: existence in some determinate time.
    • Necessity: existence of an object at all times.

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