||
时空可变系多线矢物理学的创建、作用与发展(18)2线基矢:
(接(17))
d[基矢X(xy)]= (d[基矢X(x)])叉乘[基矢X(y)] + [基矢X(x)]叉乘(d [基矢X(y)]) =-[([dl(A,a’)w(Ax’,xa’)[基矢X(x’)])叉乘[基矢X(y)], a’, x’=0到3求和]
-[ [基矢X(x)]叉乘([dl(A,a’)w(Ay’,ya’)[基矢X(y’)] ), a’, y’=0到3求和]
=-[dl(A,a’)(w(Ax’,xa’)[基矢X(x’y)]
+w(Ay’,ya’)[基矢X(xy’)]),a’,x’,y’=0到3求和]。
d[基矢X(xy)]/dt(X) =-[(dt(A)/dt(X))dl(A,a’)/dt(A)
(w(Ax’,xa’)[基矢X(x’y)]
+w(Ay’,ya’)[基矢X(xy’)]),a’,x’,y’=0到3求和]
=[(dt(A)/dt(X))dl(A,a’)/dt(A)
(w(Ax,x’a’)+w(Ay,y’a’) ) [基矢X(xy)],a’,x’,y’=0到3求和]。
(偏分l(A,a’) [基矢X(xy)]=[w(Axy,x’y’a’)[基矢X(xy)