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а ִٸ, ƹ ִ. װ ѹ ҰغѴ. . "Ŵ ?" л ä ū Ѽ ̴. ñ Ŵ ΰ? 䣩 Ŵ Դϴ. 1. Ŵ Դϱ? ܼϰԴ ȯ Ʈ. ڸŰ ǵǾ մϴ. 1.1 ȯ̶ Դϱ? ƺ ̵ ÿ ̷, ȣȯϴ մϴ. 1.1.1 ̵ Դϱ? # ڰ ִٰ սô. ϸ ̵ θϴ. 1 a ؼ a#e = e#a = a ϴ e Ѵ. Ҹ ̶ Ѵ. 2 a,b,c ؼ a#b#c = a#b#c Ѵ. չĢ̶ Ѵ. ̵ ǥ δ, Ʒ, 0 ڿ, Ʒ ڿ ֽϴ. 1.1.2 ƺ̶ Դϱ? ռ ̵忡 ߰˴ϴ. 3 a ؼ a#b = b#a = e ϴ b Ѵ. Ҹ a ̶ Ѵ. 4 a,b ؼ a#b = b#a Ѵ. ƺ ǥ δ, Ʒ , Ʒ 0 ֽϴ. 1.1.3 ȣȯϴ Դϱ? ش ٸ ڰ ־, йĢ ϴ մϴ. , a + b x c = a x c + b x c a x b + c = a x b + a x c մϴ. 1.1. Ƿ ȯ̶? ڰ ǵǾ ־, Ʒ ƺ, ٸ Ʒ ̵, ڰ ȣȯϴ Դϴ. ǥδ +, x Ʒ ֽϴ. Ʒ ƺ, Ʒ ̵, йĢ ϱ Դϴ. 밳 ȯ Z ǥմϴ. 1.2 Ʈ̶ Դϱ? ȯ ̵ մϴ. 1.2.1 ̵̶ Դϱ? ȯ R ؼ, ϴ R κ I ̵̶ մϴ. 1 I Ʒ ƺ ̷. 1.1.2 2 R r I i ؼ ri I ̴. ̸ Ʒ ִٰ ǥѴ. ǥ δ 1.1. ŷߴ ȯ Z 2 ̵ ̷, ̸ 2Z ǥմϴ. n ̸ nZ ǥմϴ. 1.2.2 ̵̶ Դϱ? ȯ R ؼ ̵ p ϸ ̵̶ մϴ. ab p Ҷ, a p ̰ų b p ҿ Ѵ. ǥ ̵ δ ȯ Ҽ p ؼ pZ ֽϴ. 1.2. Ƿ Ʈ̶? ȯ ؼ, Ҽ ̵, ̸ Ҿ̵ ̴. ȯ R ؼ Ʈ Spec A ǥѴ. 1.3.1 ̶ Դϱ? X ̶ ϰ, T X κ ̶ ϰ, T ؼ Ѵٰ սô. 1 ü X T Ҵ. 2 T ҵ T Ҵ. 3 T ҵ T Ҵ. T X topology մϴ. T Ե U ؼ U X ̶ մϴ. ݴ, V T ҷ ִٸ V X ̶ մϴ. հ ü ִ Դϴ. 1.3.2 ڸŰ ̶ Դϱ? Ʈ ϴ , Spec A հ մϴ. 1 A ̵ I ؼ I ϴ Ҿ̵ ̴. 2 A f ؼ f ʴ Ҿ̵ ̴. ̷ ǵ ڸŰ ̶ մϴ. 1.3. Ƿ Դϱ? տ ִ , ִ μ, ϳ νִ Դϴ. տ ǵǸ, ̴ ̶ θϴ. 1.4 Structure Sheaf̶ Դϱ? ̶, ӼGluing property ϴ pre-sheaf Դϴ. 1.4.1 Pre-sheaf Դϱ? X U ؼ, pre-sheaf F ǵ˴ϴ. 1 FU ȯԴϴ. 밳 U ǵ Լ ȯ̶ մϴ. 2 V ־, V U Ѵٸ, r_{VU: FV -> FU restriction map ־, մϴ. 2.i F∅ = 0 2.ii r_{UU} Լ 2.iii W,V,U ̰, W V, V U ԵǾ ִٸ r_{VW} o r_{UV} = r_{UW} 1.4.2 Ӽ̶ Դϱ? Pre-sheaf ߰մϴ. X U , U U_i ̶ Ѵ. FU_i f_i ҿ FU_j f_j Ұ ־, U_i U_j տ f_i f_j ġѴٸ, FU ϴ f ϰ Ѵ. f U_i f_i, U_j f_j ġѴ. ̶ θϴ. 1.4. Ƿ Դϱ? Դϴ. 2. ǹ̶ Դϱ? Ϲδ ݾ ̰ , , X մϴ. , Ŵ , Ŵ ̹Ƿ / ǵǾ ְ ư, Ŵ յ ǥ Ǿ ִµ , յ ϳϳ Ŵ մϴ. 3. ̶ Դϱ? X Y ؼ f:X->Y g:Y->X ־, f g ̶ X Y Ȯ ġѴٰ , δ Ұϸ, ̶ θϴ. 3.1 ̶ Դϱ? Ϲ, Լ Դϴ. C , , ȯ, ƺ Լ , ǿ µ, ̴ C ԵǾִ Դϴ. C X,Y ؼ X Y hom_CX,Y մϴ. ռ Ұ չĢ ϰ, X ؼ hom_CX,X ؾ մϴ. Ƿ Ŵ Դϱ? ⺻ ̸, յ ־, , շ δ ȯ Ʈ, Ҿ̵ հ , ڸŰ ־, Ȥ ̵ ϴ ϴķ θ ְ, ռ Ұߴ ǵǾ ִ, ̸ Ŵ ½ϴ. ̰ ˾Ƽ ? ... װ...
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濡 Ƽ ⺻Դϴ.Խù ̳ õ .
Ϸ Űǰų ߰ߵǸ ҹ Ȥ ó ˴ϴ. Ź 帳ϴ.
