Anselm (and Gaunilo)
-Gaunilo uses his "Lost Island" argument to show that

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Gaunilo's "Lost Island" argument is a reductio ad absurdum that uses Anselm's own reasoning to show that his argument leads to absurd conclusions. Gaunilo's argument shows that using Anselm's logic, one could prove the existence of any imaginary object, including a lost island, a perfect city, or a most perfect pizza. Therefore, Gaunilo's argument challenges the validity of Anselm's reasoning and shows that it does not necessarily lead to the existence of God, but can be used to prove anything that one can imagine.

Anselm (And Gaunilo) -Gaunilo Uses His "Lost Island" Argument to Show That