[微積] 幫我看懂一些變分學用到的定義與推導
圖中有四個我不了解的定義或推導
1.這個max函數
2.f(t,(u+h)(t))導到下面那式
3.o(||h||)是描述什麼||h||的性質
4.B(X,X)是什麼樣子的函數空間，跟線性差在哪裏
請給我提示或文本，感謝大家
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