{"schema_version":"ocme-site-results-v1","locale":"zh-Hant","page_type":"derivations","facts":{"questions":36000,"reviewed":36000,"display_candidates":0,"knowledge":302,"guides":299,"paths":59,"batches":360,"families":1441,"atlas":302,"core":80,"evidence":9,"formal_evidence":5,"formal_subjects":4,"lean_files":6,"lean_toolchain":"leanprover/lean4:v4.30.0","question_state":"candidate","english_state":"ai_candidate","question_Lean":"NOT_RUN","canonical_truth_promotion":false},"filters":{"q":"mko-partial-derivative"},"kind":"guides","total":1,"pages":1,"page":1,"entries":[{"id":"derivation-mko-partial-derivative-01","title":{"zh-Hant":"偏導數：由差商極限推出二次多項式的偏導公式，並計算一點的梯度","en":"Partial derivative: deriving the partial-derivative formulas of a quadratic from the difference-quotient limit, and computing a gradient"},"summary":{"zh-Hant":"對係數依 [1,x,y,x²,xy,y²] 排列的二次多項式 f，從差商極限的定義證明 ∂f/∂x=c_1+2c_3x+c_4y、∂f/∂y=c_2+c_4x+2c_5y。再對 c=(1,−2,3,1,2,−1) 算出 (1,2) 的偏導與梯度 (4,1)，並說明單一非零 h 的差商（5 或 41/10）與同時移動兩個座標（極限 5）都不是 x 偏導。","en":"For a quadratic f with coefficients in the order [1,x,y,x²,xy,y²], prove from the difference-quotient limit that ∂f/∂x=c_1+2c_3x+c_4y and ∂f/∂y=c_2+c_4x+2c_5y. Then for c=(1,−2,3,1,2,−1) compute the partials and the gradient (4,1) at (1,2), and show that a single nonzero-h quotient (5 or 41/10) and moving both coordinates at once (limit 5) are not the x-partial."},"mko_ids":["mko-partial-derivative"]}],"title":"概念推導導讀"}