第 13808 題：實內積空間

原題與已知條件

內積須同時雙線性對稱且正定。操作=inner-evaluate；資料={"matrix":[[9,2],[2,5]],"x":[0,-3],"y":[2,5]}。請依 [matrix,x,y,value] 欄序回答。

• G001 — 內積須同時雙線性對稱且正定。操作=inner-evaluate；資料={"matrix":[[9,2],[2,5]],"x":[0,-3],"y":[2,5]}。請依 [matrix,x,y,value] 欄序回答。

定義與適用範圍

沿用原題明示的論域、假設與來源 MKO 定義。本題已完成第二對話數理與中英語義覆核，並由原始參數逐題獨立重算模型、答案與每個算術步驟；原題仍為 candidate。

• mko-real-inner-product-space

逐步推導

candidate real R2 form;matrix=[[9, 2], [2, 5]];B(x,y)=x^T*A*y

matrix distributivity supplies bilinearity;other inner-product obligations remain separate

candidate evaluation matrix second slot:matrix=[[9, 2], [2, 5]];input=[2, 5]

input dimension=2;output dimension=2;rows dot input

candidate evaluation matrix second slot row0 column0 product := mul(9, 2)

candidate evaluation matrix second slot row0 column0 product = 18

candidate evaluation matrix second slot row0 column1 product := mul(2, 5)

candidate evaluation matrix second slot row0 column1 product = 10

candidate evaluation matrix second slot row0 sum := sum(18, 10)

candidate evaluation matrix second slot row0 sum = 28

candidate evaluation matrix second slot row1 column0 product := mul(2, 2)

candidate evaluation matrix second slot row1 column0 product = 4

candidate evaluation matrix second slot row1 column1 product := mul(5, 5)

candidate evaluation matrix second slot row1 column1 product = 25

candidate evaluation matrix second slot row1 sum := sum(4, 25)

candidate evaluation matrix second slot row1 sum = 29

candidate evaluation first coordinate0 product := mul(0, 28)

candidate evaluation first coordinate0 product = 0

candidate evaluation first coordinate1 product := mul(-3, 29)

candidate evaluation first coordinate1 product = -87

candidate evaluation bilinear sum := sum(0, -87)

candidate evaluation bilinear sum = -87

逐步反向核對

• S011 · premise_and_result_audit — 以精確有理數重算 candidate evaluation bilinear sum，不以小數近似替代。
• S010 · premise_and_result_audit — 以精確有理數重算 candidate evaluation first coordinate1 product，不以小數近似替代。
• S009 · premise_and_result_audit — 以精確有理數重算 candidate evaluation first coordinate0 product，不以小數近似替代。
• S008 · premise_and_result_audit — 以精確有理數重算 candidate evaluation matrix second slot row1 sum，不以小數近似替代。
• S007 · premise_and_result_audit — 以精確有理數重算 candidate evaluation matrix second slot row1 column1 product，不以小數近似替代。
• S006 · premise_and_result_audit — 以精確有理數重算 candidate evaluation matrix second slot row1 column0 product，不以小數近似替代。
• S005 · premise_and_result_audit — 以精確有理數重算 candidate evaluation matrix second slot row0 sum，不以小數近似替代。
• S004 · premise_and_result_audit — 以精確有理數重算 candidate evaluation matrix second slot row0 column1 product，不以小數近似替代。
• S003 · premise_and_result_audit — 以精確有理數重算 candidate evaluation matrix second slot row0 column0 product，不以小數近似替代。
• S002 · premise_and_result_audit — 回到原始資料與本步條件核對，不把單向推論誤稱等價。
• S001 · premise_and_result_audit — 回到原始資料與本步條件核對，不把單向推論誤稱等價。

結論

([[9, 2], [2, 5]], [0, -3], [2, 5], -87)

依上列完整代值及條件核對得到原題答案；原題編號、格式與狀態保持不變。

本題覆核與來源綁定

覆核日期：2026-10-26

原題、答案、步驟表達式、數值 AST 與既有歷史保持原樣；原來的候選狀態屬於來源歷史，不覆寫為形式化證明。