Plural of Fano; multiple Fano varieties or mathematical objects.
Simple plural of 'Fano' (the mathematical term) by adding '-s'. Maintains the proper noun reference to mathematician Gino Fano.
When mathematicians pluralize an eponym like 'Fanos,' they're acknowledging that one person's name has become shorthand for an entire category of objects—it's the ultimate honor for a mathematician, to have something named after you that gets pluralized like a common noun.
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