Projections
horizontal projection of F
H : F 2 ? Nm,
H (F) = H = (h1, ..., hm)
hi = ? f i j ; i =1, ..., m
vertical projection of F
V : F 2 ? Nn,
V (F) = V = ( v1, ..., vn)
vj = ? f i j ; j =1, ..., n
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