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Logos01 comments on Examples of the Mind Projection Fallacy? - Less Wrong
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Arguments in philosophy along the lines of "so human language has existential commitment to {possible worlds, universals, types...}, hence they exist."
Ontological Argument:
{X} is conceived of as perfectly {Y}.
To be perfectly {Y}, {X} must exist.
Therefore, {X} exists.
This is also reminiscent of Descartes' cogito:
X cannot occur without Y. X occurs. Therefore, Y exists.
(X=thought; Y=a thinking thing)
Except that's actually valid logic.
For all X, X implies Y; X, therefore Y.As opposed to
For all X, Y is required of X; Y or not Y, therefore X.<-- invalid logic is invalid.