Chain Rule and Total Dierentials
1. Find the total dierential of w = x3 yz + xy + z + 3 at (1, 2, 3).
Answer: The total dierential at the point (x0 , y0 , z0 ) is
dw = wx (x0 , y0 , z0 ) dx + wy (x0 , y0 , z0 ) dy + wz (x0 , y0 , z0 ) dz.
In our case,
AGEC 621: ECONOMETRICS FOR AGRIBUSINESS
Chapter # APPENDIX B: Rudiments of Matrix
A matrix is a rectangular array of numbers or elements arranged in
rows and columns.
More precisely, a matrix of order, or dimension, M by N (writt