Variable
ifb
The frame bracket. The contribution of the frame metric to the connection coefficients is expressed using the frame bracket:
- ifb + ifb + ifb c a b b c a a b c ifc1 = -------------------------------- abc 2
The frame bracket itself is defined in terms of the frame field and frame
metric. Two alternate methods of computation are used depending on the
value of frame_bracket_form
. If true (the default) or if the
itorsion_flag
is true
:
d e f ifb = ifr ifr (ifri - ifri - ifri itr ) abc b c a d,e a e,d a f d e
Otherwise:
e d d e ifb = (ifr ifr - ifr ifr ) ifri abc b c,e b,e c a d