Hi boosters, Further to Noah Steins message: http://lists.boost.org/Archives/boost/2005/10/95348.php I have attempted to make an implementation of grassmann points as intermediate results of cartesian point addition operations. Its available as "grassmann_point.zip" in the (new) "Graphical" directory. There is a file test.cpp in the "boost/lib/graphical/examples" directory Any comments welcome. ( Mathematicians help would be appreciated to verify whether the concepts are correct too. My grasp of grassmann spaces etc is shakey to say the least) . Enclosed is the header grassmann_point.hpp to give a flavour of the type. (Of course to run it you will need the other files in "grassmann_point.zip"). Only tested in VC7.1 All comments welcome... regards Andy Little begin 666 grassmann_point.hpp M(VEF;F1E9B!"3T]35%]'4D%02$E#04Q?5%=/7T1'4D%34TU!3E]03TE.5%]( M4%!?24Y#3%5$140-"B-D969I;F4@0D]/4U1?1U)!4$A)0T%,7U173U]$1U)! 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