▁River a ▁( born ▁ 1 9 5 3 ), ▁Mexican ▁politician ▁ ▁Other ▁ ▁Antonio ▁San chez ▁Ara u jo ▁( 1 8 8 7 – 1 9 4 6 ), ▁Cub an ▁painter ▁ ▁Antonio ▁S ánchez ▁( P uerto ▁R ican ▁host ) ▁( born ▁ 1 9 6 1 ), ▁American ▁radio ▁person ality ▁ ▁Antonio ▁S ánchez ▁( P uerto ▁R ican ▁host ) ▁( born ▁ 1 9 6 1 ) ▁ ▁Tony ▁San chez ▁( ph ot ograph er ) ▁( d ied ▁ 2 0 0 0 ), ▁English ▁photograph er <0x0A> </s> ▁In ▁algebraic ▁geometry , ▁ ▁a ▁F ano ▁variety , ▁introduced ▁by ▁G ino ▁F ano ▁in ▁, ▁is ▁a ▁complete ▁variety ▁X ▁whose ▁ant ican on ical ▁bundle ▁K X * ▁is ▁am ple . ▁In ▁this ▁definition , ▁one ▁could ▁assume ▁that ▁X ▁is ▁smooth ▁over ▁a ▁field , ▁but ▁the ▁minimal ▁model ▁program ▁has ▁also ▁led ▁to ▁the ▁study ▁of ▁F ano ▁vari eties ▁with ▁various ▁types ▁of ▁singular ities , ▁such ▁as ▁terminal ▁or ▁k lt ▁singular ities . ▁ ▁Ex amples ▁ ▁The ▁fundamental ▁example ▁of ▁F ano ▁vari eties ▁are ▁the ▁project ive ▁spaces : ▁the ▁ant ican on ical ▁line ▁bundle ▁of ▁P n ▁over ▁a ▁field ▁k ▁is ▁O ( n + 1 ), ▁which ▁is ▁very ▁am ple ▁( over ▁the ▁complex ▁numbers , ▁its ▁curv ature ▁is ▁n + 1 ▁times ▁the ▁F ub ini – St ud y ▁sym ple ctic