※ 引述《chronodl (世界就在我眼前)》之铭言： : 以下是一个有问题的论证: : Anselm’s Second Version of the Ontological Argument : 1.By definition, God is a being than which none greater can be imagined. : 2.A being that necessarily exists in reality is greater than a being that : does not necessarily exist. : 3.Thus, by definition, if God exists as an idea in the mind but does not : necessarily exist in reality, then we can imagine something that is greater : than God. : 4.But we cannot imagine something that is greater than God. : 5.Thus, if God exists in the mind as an idea, then God necessarily exists in : reality. : 6.God exists in the mind as an idea. : 7.Therefore, God necessarily exists in reality. 错误在於: 若P则Q 若Q则R P是存在 Q是完美 R是上帝 它定义若Q则R 故得证 若P则R Gaunilo’s Criticism就是指出R可以由别的取代 Gaunilo是用一个岛 所以定义若Q则I 得到若P则I 无论我们怎麽定义: 若Q则X X可以是A~Z 我们都可得到 若P则A~Z 所以说Ontological Argument是一个无效论证 好像是循环论证中的begging the question -- "若你不打算持有某只股票达十年，则十分钟也不要持有。" "如果股市可以用理论去有效分析，我早就变成路边的流浪汉了。 股神 巴菲特 --

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