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4864Infer Coarse Estimate From Richardson Output 19A second-order finite-difference scheme uses Richardson extrapolation E R = (4E fine - E coarse)/3. If E R=10.6 and E fine=10.4, what coarse-grid estimate E coarse is implied?数理金融困难数值题未尝试面试订阅4865Infer Fine Estimate From Richardson Output 20A second-order finite-difference scheme uses Richardson extrapolation E R = (4E fine - E coarse)/3. If E R=2.8 and E coarse=2.4, what fine-grid estimate E fine is implied?数理金融困难数值题未尝试面试订阅4964Finite-Difference Diagnostic 21Why can a finite-difference solve be more numerically stable than naive shooting for a stiff BVP?数学困难essay未尝试面试订阅