Deductive proofs; the concept of ‘a priori’. St Anselm - God as the greatest possible being (Proslogion 2). St Anselm - God has necessary existence (Proslogion 3).Rene Descartes - concept of God as supremely perfect being; analogies of triangles and mountains/valleys. Norman Malcolm - God as unlimited being: God's existence as necessary rather than just possible.Gaunilo, his reply to St Anselm; his rejection of the idea of a greatest possible being that can be thought of as having separate existence outside of our minds; his analogy of the idea of the greatest island as a ridicule of St Anselm's logic. Immanuel Kant’s objection - existence is not a determining predicate: it cannot be a property that an object can either possess or lack.
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