In mathematics, a Castelnuovo surface is a surface of general type such that the canonical bundle is very ample and such that c12 = 3pg − 7. Guido Castelnuovo proved that if the canonical bundle is very ample for a surface of general type then c12 ≥ 3pg − 7.
Original source: https://en.wikipedia.org/wiki/Castelnuovo surface.
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