I can not identify the steps to eliminate kn. Any tips? http://images.orkut.com/orkut/photos/RAAAAL6N_EG4TSviVRH2jlCw82umSCW9vGiTJmWJWDHthSfvgc79bQqiH4hJpgMJVVakaIV6GGrRQut0V1KGXzBuHzcndgJBhBWxsnAKrkT-XuseAJtU9VC4rwwRFmSUsIRXpD5ipeh5aHgQQA.jpg
41.1 is some other equation with k_n?
starts at the 41. Principal curvature. Lines ... http://books.google.com.br/books?id=P73DrhE9F0QC&pg=PA128&lpg=PA128&dq=principal+curvature+lines+of+curvature+gaussian+AND+MEAN&source=bl&ots=wDkpkKpPIJ&sig=hiw_1xk8P__Joj4L-FjgztWizsU&hl=pt-BR&sa=X&ei=VDaTT4uCCIWw8ATu04yqBA&ved=0CDsQ6AEwAg#v=onepage&q=principal%20curvature%20lines%20of%20curvature%20gaussian%20AND%20MEAN&f=false
So there you have another equation with k_n so you can try with that....
I did the system, but could not eliminate the kn. =/
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