Spring 2003 Derivation of lagrangian equations Basic Concept: Virtual Work Consider system of N particles located at(, x2, x,,.x3N )with 3 forces per particle(f. f, f..fn). each in the positive direction
List 1 abandon-----align abacus [ ] n. 算盘(frame with balls for calculating) (类)abacus·calculated=balance·weighted 算盘·计算=天平·称量(工具及其作用) abacus·calculate=sextant·navigate 算盘·计算=六分仪·航海(工具及其作用) abandon [ ] vt. 放弃(to give up without intent to return)n. 放任,放纵 (类)abandon·inhibition=voluble·terseness 放纵·压抑=罗嗦的·简洁(反义)
A matrix is a rectangular array of numbers. A matrix with m rows and n columns is called an m × n matrix. The plural of matrix is matrices. A matrix with the same number of rows as columns is called equal if they have the same number of rows and the same number of columns and the corresponding entries in every position are equal