Let 
and 
be distinct points, neither lying on a side line of the reference
triangle 
.
Then the 
-cross
conjugate of 
is the point
 |
Let 
be the Cevian triangle of 
, let 
be the intersection of lines 
and 
, and define 
and 
cyclically so that 
is the Cevian
triangle in 
of 
.
Then the perspector of triangles 
and 
is the 
-cross conjugate of 
.
