The Donaldson-Friedman singular fibre is realized as a Ferrand pushout whose operational Chow ring is an equalizer, yielding specialization formulas and additive second Chern cycles plus polarized charges for Ward-Hartshorne-Serre bundles.
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Geometry of the Donaldson-Friedman Pushout: Twistor degenerations and instanton charge
The Donaldson-Friedman singular fibre is realized as a Ferrand pushout whose operational Chow ring is an equalizer, yielding specialization formulas and additive second Chern cycles plus polarized charges for Ward-Hartshorne-Serre bundles.