A claimed constructive proof of the Hodge conjecture for K3 surfaces via nodal degenerations fails because the proposed degeneration has a smooth central fiber and the lifting step is unsupported.
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Constructive Proof of the Hodge Conjecture for K3 Surfaces via Nodal Degenerations
A claimed constructive proof of the Hodge conjecture for K3 surfaces via nodal degenerations fails because the proposed degeneration has a smooth central fiber and the lifting step is unsupported.