YT

+ [aa] A — [a*] B — [ac] G)

— [ab] A + [bb] B -- [bc] G)

— [oc] A — [bc] B + [ce] G).

+ [aa] A — [o^] B — [ac] G)

— [o^] A + [Ô6] B — [ftc] G)

— [ac] A — [frc] B + [ce] G).

+ [aa] A — [oA] B — [oc] G)

— [ab] A + [bb]B^ [bc] G)

— [ac] A — [6c] B + [ce] G).

Ordonnons maintenant les seconds membres par rapport à A, B, G, nous aurons :

A (+ [aa] . [a.] - [06] . [«p] - [ac] . [.7])

A =^ + B (- [06] . [..] + [bb-] . [ap] - [6c] . [«Y])

+ C (- [ac] . [m] - [6c] . [ap] + [a] . [«y]).