On Constructive Existence
Baaz and Fermueller gave in 2003 an original characterization of constructive existence in classical logic . In this note, we give a simple proof of this result based on cut-elimination in sequent calculus. The interest of this proof besides its simplicity is that it allows in particular to generalize the result to other logics enjoying cut-elimination. We also briefly discuss the significance of the characterization itself.
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