See also:

• Science: Math: Logic and Foundations: Nonstandard Logics and Extensions  (130)

• Modal Realism - Writings on modal realism and other topics in philosophy; by Damon Woolsey.
• Stanford Encyclopedia of Philosophy: Actualism - The thesis that there are no merely possible entities; by Christopher Menzel.
• Stanford Encyclopedia of Philosophy: Modal Fictionalism - Survey of the view that claims of necessity and possibility are to be construed as fictional claims; by Daniel Nolan.

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