1. ( Formula 26 are normal vectors at the intersection points and their scalar product is Formula 27 )
2. ( formula 26 are normal vectors at the intersection points . Their formula 27 product is scalar . )

no

1. Don Diego de San Francisco Tehuetzquititzin ( sometimes called Tehuetzquiti or Tehuetzqui ) ( died 1554 ) was the second '' Tlatoani '' and the 16th Governor of Tenochtitlan .
2. Don Diego de San Francisco Tehuetzquititzin ( sometimes called Tehuetzquiti or Tehuetzqui ) ( died 1554 ) was the second '' tlatoani '' and 16th governor of Tenochtitlan .

yes

1. The River Colnici is a tributary of the Borcut River in Romania .
2. The Borcut River is a tributary of the Colnici River in Romania .
no