1. This article developed the Dirac equation using four vectors and Schr�dinger operators. 2. The resulting four vector will be a vector where the homogeneous variable is not 1. 3. It was a " parallel vector processor " and supported one to four vector processors. 4. In mathematics, the "'quadruple product "'is a product of four vectors in three-dimensional Euclidean space. 5. This tensor simplifies and reduces Maxwell's equations as four vector calculus equations into two tensor field equations. 6. NEC signed a contract to deliver four vector supercomputer systems over a five-year period for $ 35.25 million. 7. NEC had signed a contract to deliver four vector supercomputer systems over a five-year period for $ 35.25 million. 8. NEC signed a contract to deliver four vector supercomputer systems over a five-year period for $ 35 . 25 million. 9. The "'Cray-2 "'is a supercomputer with four vector processors built with emitter-coupled logic and made by Cray Research starting in 1985. 10. NEC had signed a contract to deliver four vector supercomputer systems over a five-year period for $ 35 . 25 million.